Give notes on tuberculosis, especially in the context of the Pakistani population and especially it's guidelines followed in Pakistan and also compare with International guidelines: - its diagnosis - treatment and management for new cases , resistant cases MDR, XDR First line drugs , TB second line , second line , last resort , recent advances drugs and their side effects with mnemonics .. - what its different types (Based on different aspect followed in guidelines and protocols ) - how to diagnose each - how to give information on each type - a section on what different protocols and guidelines are being currently implemented in Pakistani hospitals and primary and secondary healthcare centers - and also give recent updates regarding diagnsosis and management.. What are the different types of emergencies in a tuberculosis case? How to diagnose and treat each type of TB , especially based on its site and then it's treatment regimen and duration? Types of abdominal TB Different aspects of TB related to Surgery .. What is bovine TB and what are it's different clinical aspects . What are the protocols for a latent case of tuberculosis? What pet questions about history of tuberculosis are to be taken? How to guide / counsel the family household about the case and how to treat them .. What examination findings are to be expected in a case of tuberculosis? Based on each case scenario, also give algorithms, illustrations, diagrams, and images from the latest guidelines, Textbooks from Davidson, Harrison, Kumar, and Clark textbook of medicine, and the latest Pakistani local tuberculosis guidelines. Touch every clinical and exam related aspects of the TB. Also give memorable mnemonics in an easy way to remember different information wherever necessary. Don't make unnecessary mnemonics

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Searching PubMed

tuberculosis Pakistan guidelines treatment

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Pakistan National TB Program guidelines 2024 2025 treatment protocols NTP

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tuberculosis chest X-ray findings cavitation upper lobe

This diagnostic image is a posteroanterior (PA) chest X-ray demonstrating significant pulmonary pathology. The primary finding is located in the right upper lobe, where there are dense, heterogeneous exudative opacities consistent with lung consolidation. Within this region of increased density, a prominent, thick-walled radiolucent cavity is visible, indicating tissue necrosis or cavitation. The distribution of these findings is highly suggestive of secondary (reactivation) pulmonary tuberculosis. In contrast, the left lung field appears relatively clear, although subtle interstitial markings may be present. Key anatomical landmarks including the trachea, clavicles, and cardiac silhouette are visible, with the trachea appearing midline. This image serves as a classic educational example of cavitary lung disease and apical inflammatory processes, emphasizing the radiographic presentation of Mycobacterium tuberculosis infection in an adult patient.

A posterior-anterior (PA) chest x-ray demonstrating bilateral pulmonary abnormalities. In the left upper lobe, there is a prominent hazy increased density or opacity, containing internal lucency suggestive of cavitary changes. The right lung shows a smaller, irregular density localized in the right middle lobe. These findings are clinically significant as they often represent infectious processes such as pulmonary tuberculosis or pyogenic pneumonia, or chronic fibrotic changes. The mediastinal contour and cardiothoracic ratio appear within normal limits. Radiopaque external markers are visible overlying the upper lung fields. This diagnostic image illustrates key radiological signs of pulmonary infiltration and cavitation, relevant for medical education regarding the diagnostic workup of mycobacterial infections and differential diagnosis of apical lung lesions.

$This diagnostic image is an anteroposterior (AP) chest X-ray demonstrating significant bilateral pulmonary pathology. The primary findings include diffuse, hazy opacities and patchy infiltrates throughout both lung fields, with a higher concentration and increased density in the upper lobes. Notably, the left upper lung zone exhibits lucent areas suggestive of cavitation within a region of dense consolidation. The right lung also shows extensive infiltrative changes. The cardiac silhouette is partially obscured by the adjacent pulmonary densities. Osseous structures, including the ribs and clavicles, appear intact without evidence of acute fractures or destructive lesions. Radiopaque EKG leads are visible on the chest wall. Clinically, such a pattern of cavitary lesions and upper lobe infiltrates is characteristic of chronic granulomatous infections such as pulmonary tuberculosis, or progressive malignancies like Hodgkin lymphoma with pulmonary involvement. This image serves as a key educational example for recognizing complex parenchymal lung disease and identifying cavitary features on plain film radiography.$

This diagnostic image is an anteroposterior (AP) chest X-ray demonstrating significant bilateral pulmonary pathology. The primary findings include diffuse, hazy opacities and patchy infiltrates throughout both lung fields, with a higher concentration and increased density in the upper lobes. Notably, the left upper lung zone exhibits lucent areas suggestive of cavitation within a region of dense consolidation. The right lung also shows extensive infiltrative changes. The cardiac silhouette is partially obscured by the adjacent pulmonary densities. Osseous structures, including the ribs and clavicles, appear intact without evidence of acute fractures or destructive lesions. Radiopaque EKG leads are visible on the chest wall. Clinically, such a pattern of cavitary lesions and upper lobe infiltrates is characteristic of chronic granulomatous infections such as pulmonary tuberculosis, or progressive malignancies like Hodgkin lymphoma with pulmonary involvement. This image serves as a key educational example for recognizing complex parenchymal lung disease and identifying cavitary features on plain film radiography.

Diagnostic imaging composite of a 66-year-old male with active pulmonary tuberculosis (TB), comprising a posteroanterior chest X-ray (A), a lateral chest X-ray (B), and an axial High-Resolution Computed Tomography (HRCT) scan (C). Panels A and B demonstrate increased opacity in the left upper lung zone indicative of consolidation, with radiolucent areas representing cavitation (white arrows). Panel C, the HRCT at the level of the lower lobes, provides a detailed view of the pulmonary pathology. It reveals a focal area of dense consolidation containing a central air-filled cavity (white arrow) in the left lung. Additionally, characteristic 'tree-in-bud' patterns are visible (black arrows), consisting of small centrilobular nodules and branching linear opacities that indicate endobronchial spread of infection within the upper segment of the left lower lobe. These imaging findings are hallmark radiological features of secondary or active tuberculosis, illustrating parenchymal destruction and small airway involvement.

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TB granuloma histology Langhans giant cells caseating necrosis

Histology of granulomatous mastitis on bright-field light microscopy. A dense inflammatory infiltrate forms granulomas centered on Langhans-type giant cells surrounded by epithelioid histiocytes, scattered lymphocytes, and occasional eosinophils. The image depicts a high-power view of the center of a granuloma within breast tissue biopsy; multinucleated giant cells with horseshoe-shaped nuclei are evident. The granulomatous architecture includes a peripheral rim of lymphocytes and histiocytes with minimal necrosis described. Staining by Hematoxylin and Eosin highlights basophilic nuclei and eosinophilic cytoplasm; pink collagenous stroma and adipose breast tissue may be visible in the background. Clinically, granulomatous mastitis can mimic infectious etiologies or neoplasia; the presence of Langhans giant cells strongly suggests a granulomatous process and warrants infectious workup for tuberculosis and fungal pathogens, as well as consideration of sarcoidosis or granulomatous reaction to foreign material. This image is diagnostic for granulomatous inflammation in breast tissue when correlated with clinical data and microbiologic studies; useful for education, differential diagnosis, and research on breast granulomatous disease. Additional educational value lies in distinguishing nonnecrotizing granulomas from caseating TB patterns, correlating histology with mammography and ultrasound, and guiding microbiologic testing and patient management in suspected granulomatous breast disease. The image supports teaching of granuloma biology and pathology.

Light microscopy of an H&E-stained formalin-fixed tissue section at low to intermediate magnification reveals granulomatous inflammation characterized by well-formed nodular aggregates of epithelioid histiocytes and occasional Langhans-type multinucleated giant cells embedded in a fibrous stromal matrix. The granulomas appear in close association with accentuated lymphocytic cuffs and scattered plasma cells. Central areas show coagulative or caseating necrosis in some nodules, giving a pale eosinophilic center surrounded by a rim of epithelioid cells. The surrounding dermis/soft tissue shows delicate reticular fibers and vascular congestion with perivascular mononuclear infiltrates. There are no overt bacterial organisms evident with standard H&E, though organisms such as mycobacteria or fungi may require special stains (Ziehl-Neelsen, GMS) to confirm infection. The architecture suggests a granulomatous process rather than acute suppurative inflammation. Diagnostic significance: indicative of granulomatous disease; differential includes infectious etiologies (tuberculosis, fungal infections) and noninfectious conditions (sarcoidosis, foreign-body reaction). Clinical correlation recommended with exposure history, immunologic status, and targeted staining/cultures. Potential use cases: educational demonstration of granuloma morphology, pathology student review, differential diagnosis in infectious and granulomatous diseases, histology atlas reference. This description supports search for terms granuloma, epithelioid histiocytes, Langhans giant cells, caseation, TB, sarcoidosis, histopathology.

This is a histopathology image obtained with light microscopy from a formalin-fixed paraffin-embedded tissue section stained with Hematoxylin and Eosin. The field demonstrates a granulomatous inflammatory lesion, typically well circumscribed. The central area shows eosinophilic, acellular to granular necrotic material (caseous necrosis), surrounded by a dense mantle of epithelioid histiocytes with elongated, pale-staining nuclei and abundant pale cytoplasm. Multinucleated giant cells of the Langhans type may be present at the periphery. Scattered lymphocytes and occasional plasma cells form a peripheral lymphohistiocytic cuff around the granuloma. The surrounding stroma contains collagen fibers and occasional fibroblasts, with minimal additional inflammatory cells in this field. The morphology is classic for granulomatous inflammation, most commonly associated with infectious etiologies such as Mycobacterium tuberculosis or fungal infections, but can be seen in sarcoidosis or foreign body reactions depending on clinical context. Diagnostic significance: identification of a caseating granuloma raises suspicion for mycobacterial or fungal infection and warrants targeted microbiologic stains (Ziehl-Neelsen for acid-fast bacilli; GMS or PAS for fungi), cultures, and molecular testing. Clinical correlation is essential, including TB exposure history, immune status, and presentation—cough, weight loss, fever, pulmonary nodules or granulomatous lymphadenitis. This image is educational for teaching, differential diagnosis, and research into granulomatous disease pathology.

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MDR-TB XDR-TB treatment bedaquiline pretomanid linezolid

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miliary tuberculosis chest X-ray millet seed pattern

Anterior-Posterior (AP) chest X-ray of a pediatric patient demonstrating a classic 'millet seed' pattern. The image shows widespread, diffuse, and symmetric tiny nodular opacities distributed throughout both the right and left lung fields, from the apices to the bases. These micronodular densities are discrete and uniform in size, characteristic of miliary tuberculosis. The cardiac silhouette, mediastinum, and trachea appear within normal limits for the patient's age. Osseous structures, including the clavicles, ribs, and shoulders, are clearly visible. The presentation illustrates the typical radiological findings associated with hematogenous dissemination of Mycobacterium tuberculosis. This diagnostic image serves as an educational example of miliary lung disease and its manifestation in clinical radiography within a Pediatric Intensive Care Unit (PICU) context.

This diagnostic image is a posterior-anterior (PA) chest x-ray demonstrating classic features of miliary tuberculosis. The primary finding is a diffuse, bilateral, and symmetric distribution of small, discrete nodular opacities, approximately 1-3 mm in diameter, creating a 'miliary mottling' pattern throughout both lung fields. These millet-seed-sized nodules result in an overall granular appearance and increased density of the lung parenchyma. Yellow oval annotations highlight representative areas of the miliary pattern in the mid-lung zones. The cardiac silhouette, mediastinal contours, and diaphragmatic domes appear within normal limits without evidence of gross lymphadenopathy or pleural effusion. The visible skeletal structures, including the ribs and clavicles, show no obvious abnormalities. This radiological presentation is highly characteristic of hematogenous dissemination of Mycobacterium tuberculosis, making it a critical educational resource for understanding systemic mycobacterial disease manifestations in pulmonology and infectious disease.

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tuberculin skin test Mantoux test technique reading

A series of three clinical photographs demonstrating the procedural steps of a Tuberculin Skin Test (TST), specifically utilizing the Mantoux technique. The image sequence illustrates the administration of purified protein derivative (PPD) on the volar aspect of the forearm in a patient with systemic sclerosis. The first frame shows a tuberculin syringe with a needle inserted at a shallow angle for intradermal injection. The second frame depicts the immediate result: the formation of a discrete, pale, raised wheal approximately 6–10 mm in diameter, indicating correct superficial placement. The third frame shows the site after a circular mark has been drawn around the wheal's perimeter to facilitate localized identification for follow-up interpretation. The skin of the patient shows characteristic features of systemic sclerosis, including localized hypopigmentation and a taut, thickened texture. This visual serves as an educational guide for infectious disease screening and diagnostic dermatology, emphasizing proper technique and the specific challenges of skin testing in patients with scleroderma.

Clinical photography of a Mantoux tuberculin skin test reaction performed on the forearm. Imaging modality: clinical photography; technique: high-resolution, close-up digital photograph under standard lighting; magnification: macro. Anatomical location: forearm skin at the intradermal injection site of tuberculin purified protein derivative (PPD). Visual features: a circular, ulcerated patch with a dark necrotic center, surrounded by a violaceous to pink erythematous halo, peripheral induration, and surrounding edema. Crusting is evident at the lesion margin, with a slightly sunken center. Pathophysiology: this appearance suggests a pronounced delayed-type hypersensitivity reaction (Type IV) to tuberculin; in some cases, intense reactions may produce ulceration or necrosis, though mild induration is more common. Differential diagnosis includes an overly vigorous Mantoux reaction, superimposed infection (impetigo or cellulitis), or injection-site ulceration, and should be correlated with induration size measured after 48–72 hours and clinical history. Clinical significance: a positive reaction indicates TB exposure or BCG vaccination response, but interpretation depends on risk factors and time since exposure. Potential clinical use: TB screening, exposure assessment, vaccine response evaluation, dermatology teaching, medical education, and research training in cutaneous hypersensitivity. Note: lesions of this severity are uncommon in routine screening and require urgent clinical correlation. Documentation should include induration measurement and patient risk factors.

Searching the Web

Pakistan NTP tuberculosis treatment guidelines 2023 2024 MDR XDR BPaL regimen

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https://pmc.ncbi.nlm.nih.gov/articles/PMC12333698

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TB lymphadenopathy cervical scrofula neck swelling

A clinical photograph of the lateral neck region of a patient, demonstrating a large, protruding mass consistent with cervical lymphadenopathy. The swelling is approximately 5-7 cm in diameter, exhibiting a lobulated and rounded morphology. The overlying skin shows significant pathological changes, including intense erythema (redness), localized edema that gives the surface a shiny and stretched appearance, and areas of focal ulceration or crusting suggestive of an impending or active fistula formation (scrofuloderma). The visual presentation illustrates paradoxical tuberculosis-associated immune reconstitution inflammatory syndrome (TB-IRIS), where existing lymph node lesions worsen after the initiation of antiretroviral therapy (ART) in HIV-infected individuals. Key educational features include the signs of acute inflammation and tissue breakdown in the context of chronic infectious lymphadenitis.

This dual-panel image demonstrates the clinical and radiological presentation of tuberculous cervical lymphadenitis, commonly known as scrofula. Panel (a) is a clinical photograph of a 32-year-old male showing progressive, discrete, and mobile lumps in the lateral neck. A notable finding is the presence of cutaneous fistulization, where an underlying nodal mass has ruptured through the skin, creating a chronic draining sinus tract. Panel (b) is a corresponding ultrasound image of the cervical region. Red arrows highlight multiple enlarged, hypoechoic lymph nodes. These nodes exhibit loss of the normal fatty hilum and internal heterogeneity, characteristic of central caseous necrosis. The correlation between the two panels illustrates the progression from internal nodal necrosis to subcutaneous abscess formation and eventual external fistulization. This presentation is a hallmark of extrapulmonary tuberculosis (EPTB) in endemic regions, emphasizing the importance of considering chronic granulomatous infections in the differential diagnosis of unilateral cervical lymphadenopathy with skin involvement.

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TUBERCULOSIS - COMPREHENSIVE CLINICAL NOTES

Pakistan Context + International Guidelines | Harrison's, Murray & Nadel's, Davidson's, Surgical Textbooks + WHO/NTP 2024-2026

PART 1 - EPIDEMIOLOGY AND PAKISTAN CONTEXT

Global Burden

TB remains the world's deadliest infectious disease (after COVID-19). WHO Global TB Report 2025 confirms 1.25 million deaths from TB in 2023 (down from 1.32 million in 2022). Globally, 7.4 million people were treated for TB in 2024.

Pakistan - A High-Burden Country

Pakistan is ranked 5th among the 10 countries contributing to 75% of the global MDR/RR-TB treatment gap.

Indicator	Pakistan (2023 Data)
Population	248 million
Total TB cases notified	480,136
Treatment success rate	95% (SAARC best)
HIV co-infection in TB	0.39%
MDR-TB estimated	~35,000-40,000/year
Only 11% MDR-TB diagnosed and treated	Major gap

Risk factors particularly relevant in Pakistan:

Overcrowding, poverty, malnutrition
High prevalence of diabetes (TB-DM comorbidity major challenge per 2024 meta-analysis, PMID 38346381)
Delayed diagnosis due to stigma
High proportion of cases in rural Sindh, KPK, Balochistan
BCGosis risk in infants post-BCG vaccination (PMID 41459544)

PART 2 - HISTORY TAKING IN TB (PET QUESTIONS)

HISTORY - TEMPLATE

"SWIFT-PAST" mnemonic for TB history:

S - Symptoms (PCFW): Persistent cough >2 weeks, Constitutional fever (evening rise), Fatigue/weight loss, blood-streaked sputum (haemoptysis) W - Weight loss (how much, over how long?) I - Investigation history (prior CXR, sputum, GeneXpert results) F - Family contact (household contact with known TB case?) T - Treatment history (prior TB treatment - critical for categorization) P - Past medical history (DM, HIV, steroid use, malignancy, ESRD) A - Animals (bovine TB - unpasteurized milk exposure) S - Social history (overcrowding, migration, prison, homelessness, healthcare worker) T - Travel/occupation (endemic area, healthcare worker, laboratory worker)

Cardinal Symptoms

Symptom	Feature in TB
Cough	>2 weeks, productive
Fever	Low-grade, characteristically evening rise ("hectic/quotidian")
Night sweats	Drenching, change of clothes
Weight loss	>5-10% body weight
Haemoptysis	Variable - spotting to massive
Dyspnoea	Pleural effusion, pneumothorax, miliary
Chest pain	Pleuritic (pleuritis)

PART 3 - CLASSIFICATION OF TUBERCULOSIS

A. By Site (Anatomical Classification)

Pulmonary TB (PTB) - ~80% of all cases

Upper lobe predominance (apical/posterior segments RUL, apicoposterior LUL)
Cavitation, consolidation, nodules, bronchiectasis

Extrapulmonary TB (EPTB) - ~20% (higher in HIV+, children)

Site	Frequency	Key Features
Lymph nodes (Scrofula)	Most common EPTB	Cervical, supraclavicular
Pleural	2nd most common	Unilateral effusion, ADA elevated
Bone/Joint (Pott's)	Spine most common	T8-T12, gibbus, cord compression
CNS (TBM)	Most serious	Basal meningitis, hydrocephalus
Abdominal	Terminal ileum, peritoneum	Dough belly, ascites
Pericardial	Constrictive pericarditis	Beck's triad, pulsus paradoxus
Genitourinary	Kidney most common	"Sterile pyuria"
Skin	Lupus vulgaris, scrofuloderma	Apple-jelly nodules

B. By Bacteriology (WHO/NTP Classification)

Type	Definition
Drug-Susceptible TB (DS-TB)	Sensitive to all first-line drugs
Isoniazid-resistant TB (Hr-TB)	Resistant to INH only
Rifampicin-resistant TB (RR-TB)	Resistant to Rifampicin (any)
MDR-TB	Resistant to both INH + Rifampicin
Pre-XDR-TB	MDR + resistance to any fluoroquinolone
XDR-TB	MDR + resistance to fluoroquinolone + at least one of bedaquiline or linezolid

Note: WHO revised XDR-TB definition in 2021. Pakistan NTP has adopted this updated definition.

C. By Treatment History (NTP Categorization)

Category	Definition	Regimen
New case	Never treated or <1 month treatment	Cat I: 2HRZE/4HR
Previously treated (Relapse)	Completed treatment, bacteriologically positive again	Cat II: 2HRZES/1HRZE/5HRE
Treatment failure	Sputum positive at month 5+	DR-TB regimen
Lost to follow-up	Interrupted >2 months	Re-evaluate; restart or DR-TB
Treatment after failure	—	DST-guided

D. By Latency Status

Type	Features
Latent TB Infection (LTBI)	TST+/IGRA+ but no symptoms, no active disease
Active TB Disease	Symptoms + bacteriological/histological confirmation
Primary TB	First infection; often lower/middle lobe + hilar adenopathy
Post-primary (Reactivation) TB	Upper lobe, cavitation
Progressive Primary TB	Cavitation in primary without resolution
Miliary TB	Haematogenous dissemination

PART 4 - DIAGNOSIS

Algorithm - Diagnosis of Pulmonary TB

SUSPECTED TB (cough >2wks + constitutional symptoms + CXR abnormality)
        |
        v
SPUTUM SMEAR (ZN stain) x 2
        |
    [+] ---------------------> Notify + Start HRZE (Category I)
    [-] or paucibacillary
        |
        v
GeneXpert MTB/RIF (Cartridge-Based NAAT - CBNAAT)
        |
    MTB detected, Rif Sensitive -----> DS-TB regimen
    MTB detected, Rif Resistant ------> DR-TB workup (LPA/DST)
    MTB not detected
        |
        v
    Clinical probability + CXR + Culture (LJ/MGIT)
        |
    HRCT Chest if needed

Diagnostic Tests

1. Sputum Smear Microscopy (ZN Stain)

Ziehl-Neelsen stain - acid-fast bacilli appear bright red on blue background
First-line, cheap, widely available in Pakistan PHC
Sensitivity: 45-80% (lower in HIV+, paucibacillary)
3+ grading: Scanty (1-9 AFB/100 fields), 1+ (10-99), 2+ (1-10/field), 3+ (>10/field)

2. GeneXpert MTB/RIF (Xpert)

WHO-recommended first-line diagnostic
Sensitivity ~89%, Specificity ~99%
Detects MTB AND rifampicin resistance in 2 hours
Pakistan NTP: GeneXpert is the primary diagnostic tool at district hospitals and above
Xpert Ultra: improved sensitivity for paucibacillary disease

3. Culture (Gold Standard)

LJ (Lowenstein-Jensen) solid medium: 4-8 weeks
MGIT (Mycobacterial Growth Indicator Tube): liquid, 1-3 weeks
Required for DST in DR-TB

4. Line Probe Assay (LPA) / Hain GenoType

FL-LPA (First Line): detects INH and Rifampicin resistance
SL-LPA (Second Line): detects FQ + SLI resistance
Pakistan NTP: Available at provincial reference labs (PMRC, NRL Islamabad)

5. Tuberculin Skin Test (TST / Mantoux)

Inject 0.1 mL PPD (5 TU) intradermally, read at 48-72 hours
Measure induration (not erythema) transverse to long axis of arm

Threshold	Population
≥5 mm	HIV+, recent close contact, immunosuppressed, old CXR changes
≥10 mm	Healthcare workers, prisoners, migrants, diabetics, children <5 yrs, Pakistan general population
≥15 mm	Low-risk population

Mantoux TST technique showing intradermal injection, wheal formation, and reading

Mantoux tuberculin skin test: intradermal injection, wheal, and site marking

6. IGRA (Interferon-Gamma Release Assay)

QuantiFERON-TB Gold Plus, T-SPOT.TB
Not affected by BCG vaccination (unlike TST)
Not widely available in Pakistan public sector
Preferred for LTBI screening in BCG-vaccinated populations
Pakistan NTP: TST preferred for household contact investigation (turns positive earlier)

7. Chest X-Ray Features

Primary TB:

Middle or lower lobe opacity + ipsilateral hilar adenopathy (Ghon complex + Ranke complex)

Post-Primary (Reactivation) TB:

Upper lobe, apical/posterior segments, cavitation common

Primary TB CXR showing lower lobe consolidation and hilar adenopathy

Primary TB: right lower lobe consolidation with right hilar and paratracheal lymphadenopathy (arrows) - Murray & Nadel's

Cavitary reactivation TB - right upper lobe

Classic reactivation TB: right upper lobe cavitation with surrounding heterogeneous consolidation

Advanced bilateral cavitary TB with upper lobe infiltrates

HRCT showing left upper lobe cavitation + tree-in-bud pattern (black arrows) = endobronchial spread

Miliary TB:

1-3 mm nodules diffusely throughout both lungs ("millet seeds")

Miliary TB: classic 'millet seed' pattern on CXR - hematogenous dissemination

8. Histopathology

Caseating granuloma with Langhans giant cells = hallmark
ZN stain/auramine rhodamine fluorescence for AFB
Epithelioid histiocytes + central caseous necrosis

Caseating granuloma histology with epithelioid cells and central necrosis

Caseating granuloma: central eosinophilic caseous necrosis surrounded by epithelioid histiocytes and peripheral lymphocytic cuff - hallmark of TB

Granulomatous inflammation with Langhans-type giant cells (horseshoe nuclei) and caseating necrosis

9. ADA (Adenosine Deaminase)

Pleural fluid ADA >40 IU/L: highly suggestive of TB pleuritis
CSF ADA elevated in TBM
Ascitic fluid ADA in peritoneal TB

10. BACTEC/MGIT Culture + DST

Required for all retreatment and DR-TB suspect cases
Pakistan NTP: Free at National TB Reference Lab (NRL), Islamabad

PART 5 - EXAMINATION FINDINGS BY SITE

Pulmonary TB - Examination

Finding	Significance
Reduced chest movement	Consolidation/effusion
Dull to percussion	Consolidation, effusion, empyema
Bronchial breath sounds	Consolidation
Crackles (crepitations)	Active consolidation
Amphoric breath sounds	Cavitation (hollow, bottle-like)
Decreased air entry	Effusion, collapse
Trachea deviation	Away from effusion, toward fibrosis/collapse
Clubbing (rare in TB)	Empyema, bronchiectasis

Lymph Node TB (Scrofula)

Cervical > supraclavicular > axillary
Initially discrete, firm, mobile
Progress to: matted, soft (caseation), collar-stud abscess, discharging sinus
Sinuses leave characteristic "laddertracks" scars

Cervical TB lymphadenopathy with scrofuloderma and fistula formation

Scrofula: tuberculous cervical lymphadenitis with skin fistulization and draining sinus

Pott's Disease (Spinal TB)

Gibbus deformity (angular kyphosis)
Local vertebral tenderness
Paraplegia/paraparesis (cold abscess compressing cord)
Psoas abscess: fluctuant mass at femoral triangle or iliac fossa

TB Meningitis

Signs of meningeal irritation (Kernig's, Brudzinski's)
Cranial nerve palsies (III, IV, VI - basal exudate)
Altered consciousness, papilloedema (raised ICP)

TB Pericarditis

Beck's triad: hypotension + muffled heart sounds + raised JVP
Pulsus paradoxus (tamponade)
Friction rub (early)
Kussmaul's sign (constrictive pericarditis)

Peritoneal TB (Abdominal)

"Dough belly": doughy sensation on palpation (matted omentum, loops)
Ascites (exudate, ADA elevated)
Tenderness, usually without peritonism
Palpable mesenteric lymph nodes (periumblical)

PART 6 - TREATMENT AND MANAGEMENT

Standard Short-Course Regimen (DS-TB New Cases)

Mnemonic: "RIPE" then "RI"

2HRZE / 4HR

2 months Intensive Phase: Hisoniazid + Rifampicin + Pyrazinamide + Ethambutol

4 months Continuation Phase: Hisoniazid + Rifampicin

Same as WHO, Pakistan NTP, and Pakistan Chest Society (PCS) 2020 guidelines

First-Line Drug Details, Doses, Side Effects

Mnemonic for first-line drugs: "RIPE"

Drug	Daily Dose (adult)	Mechanism	Key Side Effects	Mnemonic
Rifampicin	10 mg/kg (max 600 mg)	RNA polymerase inhibitor	Orange secretions, Hepatotoxicity, Drug interactions (CYP450 inducer), Flu-like syndrome (intermittent)	Red/Orange urine
Isoniazid	5 mg/kg (max 300 mg)	Mycolic acid synthesis inhibitor (KatG activation)	Peripheral neuropathy (pyridoxine prevents), Hepatotoxicity, Lupus-like syndrome	INH needs B6
Pyrazinamide	25 mg/kg (max 2g)	Disrupts membrane energetics in acidic pH	Hepatotoxicity, Gout (hyperuricaemia), Arthralgia	PyriZINE = joint PAIN
Ethambutol	15-20 mg/kg	Arabinogalactan synthesis inhibitor	Optic neuritis (colour vision, visual acuity - red-green), Hyperuricaemia	Eyes (EMB = Eye damage)

Add-on: Pyridoxine (Vitamin B6) 10-25 mg/day with INH to prevent peripheral neuropathy

Streptomycin (S) - used in retreatment Category II

Aminoglycoside, IM injection
Side effects: Ototoxicity (8th nerve), nephrotoxicity, vestibular damage

Extended Regimen for Retreatment (Category II)

2HRZES / 1HRZE / 5HRE

2 months: HRZE + Streptomycin

1 month: HRZE

5 months: HRE

Note: Pakistan NTP is phasing this out in favour of DST-guided therapy for retreatment cases

Special Situations - Duration Extension

Situation	Extension
Cavitation on CXR + culture positive at 2 months	Extend total to 9 months (4HR -> 7HR)
CNS TB (TBM, spinal)	9-12 months total
Bone/Joint TB	9-12 months
Pericardial TB + steroids	6 months (+prednisolone 60mg/d taper)
HIV+ with severe immunosuppression	9 months minimum

PART 7 - DRUG-RESISTANT TB (DR-TB)

Definitions

Term	Definition
RR-TB	Resistant to Rifampicin (any mechanism)
MDR-TB	Resistant to INH + Rifampicin
Pre-XDR-TB	MDR-TB + resistant to any fluoroquinolone
XDR-TB	MDR-TB + FQ resistance + Bdq or Lzd resistance

WHO Drug Classification for DR-TB (2022 Update)

Group A (Include all three unless contraindicated):

Levofloxacin/Moxifloxacin (Lfx/Mfx)
Bedaquiline (Bdq)
Linezolid (Lzd)

Group B (Add one or both): 4. Clofazimine (Cfz) 5. Cycloserine/Terizidone (Cs/Trd)

Group C (Add to complete regimen when Group A/B insufficient): 6. Ethambutol (E) 7. Delamanid (Dlm) 8. Pyrazinamide (Z) 9. Imipenem-cilastatin/Meropenem with clavulanate 10. Amikacin/Streptomycin (injectable, last resort) 11. Ethionamide/Prothionamide (Eto/Pto) 12. p-Aminosalicylic acid (PAS)

MDR-TB Regimens

Standard Long Oral Regimen (18-20 months)

Bdq + Lfx/Mfx + Lzd + Cfz +/- Cs (ABCL - "ABuCket of LinColn")

Shorter Oral Regimen (9-11 months) - WHO 2022

BDQ-Lfx-Lzd-Cfz-Z-E-H(high dose) [when FQ-susceptible] OR BDQ-Mfx-Lzd-Cfz-Z-E-Pto

BPaL / BPaLM Regimen (6 months) - THE NEWEST

BPaL = Bedaquiline + Pretomanid + Linezolid (600mg) BPaLM = BPaL + Moxifloxacin (when FQ-susceptible)

Aspect	BPaL	BPaLM
Duration	6 months	6 months
Indication	XDR-TB, pre-XDR-TB, treatment-intolerant MDR-TB	MDR-TB with FQ susceptibility
Approval	FDA 2019 (Nix-TB study)	WHO recommended 2022
Pakistan	Piloted 2023-2024 at Rawalpindi, Multan, Lahore, Peshawar	Being rolled out under NTP + TB Alliance

Key notes on Pakistan's BPaL rollout (Ann Med Surg 2025):

Pakistan NTP updated guidelines to include 6-month all-oral BPaL/BPaLM regimens
TB Alliance licensed Pretomanid to Remington Pharmaceutical Industries (Pakistan) royalty-free
ASD (Action for Social Development) partnered with NTP for rollout in Punjab and KPK

Second-Line Drug Details and Side Effects

Drug	Mechanism	Key Side Effects
Bedaquiline	ATP synthase inhibitor (diarylquinoline)	QT prolongation, hepatotoxicity, nausea. Monitor ECG
Pretomanid	Mycolic acid inhibitor (nitroimidazole)	Peripheral neuropathy, hepatotoxicity, QT prolongation
Linezolid	50S ribosome inhibitor (oxazolidinone)	Myelosuppression, peripheral neuropathy (dose-limiting), optic neuritis, serotonin syndrome
Moxifloxacin	DNA gyrase/topoisomerase IV	QT prolongation, tendinopathy, CNS effects
Clofazimine	Free radical generation, membrane depolarization	Orange-brown skin/secretions discolouration (reversible), GI intolerance
Cycloserine	Alanine racemase inhibitor (cell wall)	Seizures, psychosis, depression, peripheral neuropathy
Delamanid	Mycolic acid inhibitor	QT prolongation, hypoalbuminaemia
Amikacin	Aminoglycoside (30S ribosome)	Ototoxicity, nephrotoxicity
Ethionamide	Mycolic acid inhibitor	GI intolerance, hypothyroidism, hepatotoxicity
PAS	Folate synthesis disruption	GI intolerance, hypothyroidism, hepatotoxicity
Imipenem/Meropenem	Beta-lactam (cell wall)	Seizures (imipenem), GI upset

Mnemonic for QT-prolonging TB drugs:

"BeDaqui-Lines Mox-ifloxacin CloFazimine" Bedaquiline + Delamanid + Levofloxacin/Moxifloxacin + Clofazimine = BDLC - "Big Danger, Long Corrected (QT)"

PART 8 - TREATMENT BY SITE (DURATION TABLE)

Site	Regimen	Duration	Special Notes
Pulmonary (new, DS)	2HRZE/4HR	6 months	Extend to 9 months if cavitation + culture+ at 2m
Lymph node	2HRZE/4HR	6 months	Paradoxical reactions common; do NOT change drugs
Pleural	2HRZE/4HR	6 months	Drain large effusions; steroids reduce adhesions
Bone/Joint (Pott's)	2HRZE/7-10HR	9-12 months	Surgery for cord compression, instability, cold abscess
CNS (TBM)	2HRZE/10HR	12 months	Dexamethasone mandatory (0.4 mg/kg/d x 4 weeks taper); ethambutol poor CNS penetration - replace with Streptomycin in some protocols
Pericardial	2HRZE/4HR	6 months	Prednisolone 60 mg/d taper; pericardiectomy if constrictive
Abdominal (intestinal/peritoneal)	2HRZE/4-7HR	6-9 months	Surgery for obstruction, perforation
Genitourinary	2HRZE/4HR	6 months	Avoid catheterisation; steroids for ureteric stricture
Miliary	2HRZE/7-10HR	9-12 months	Steroids if adrenal involvement or severe hypoxia
Adrenal TB	2HRZE/7HR	9 months	Steroid replacement if adrenal insufficiency (Addisonian crisis risk)
Skin TB	2HRZE/4HR	6 months	—

PART 9 - ABDOMINAL TUBERCULOSIS

Types (S. Das Surgical Manual + Sleisenger & Fordtran)

A. Intestinal Tuberculosis

Ulcerative TB (more common)
- Results from swallowed sputum in pulmonary TB
- Multiple transverse ulcers at terminal ileum
- Thickened serosa - rarely perforates
- Healing -> stricture formation
- Symptoms: diarrhoea, weight loss, RIF pain, occult blood
- Barium: "Stierlin's sign" - non-filling of terminal ileum (fleeting filling defect)
Hyperplastic Ileo-caecal TB
- Most common type in South Asia including Pakistan
- Cauliflower-like mass at ileocaecal junction
- Mimics carcinoma cecum or Crohn's disease
- RIF mass + constitutional symptoms
- CT: concentric thickening, pulled up cecum

B. Tuberculosis of Mesenteric Lymph Nodes

Presentations:

Chronic central abdominal pain (discomfort)
General symptoms (weight loss, fever)
Intestinal obstruction (adherent loops)
Mimics appendicitis (RIF pain, nausea)
Cold abscess (pseudomesenteric cyst between mesenteric leaves)
Calcified lymph nodes on plain X-ray (late finding)

C. Peritoneal TB

Wet type (exudative ascites): most common; ADA >40, protein >3 g/dL, SAAG <1.1
Dry type (adhesive/plastic): matted loops, "dough belly"
Fibrotic type: thick omental cake, loculated ascites

Diagnosis of Abdominal TB:

Ascitic fluid: ADA (>40), protein, SAAG
Colonoscopy + biopsy: ileocaecal region
Laparoscopy + peritoneal biopsy: gold standard for peritoneal TB
CT abdomen: mesenteric lymphadenopathy, ascites, bowel wall thickening

Differentiating Intestinal TB from Crohn's Disease:

Feature	Intestinal TB	Crohn's Disease
Geography	South Asia, Africa	Western
Caseating granuloma	Yes	No
Submucosal fibrosis	Circumferential	Transmural
Perianal disease	Rare	Common
Fistulae	Less common	Common
ADA	Elevated	Normal
AFB stain/culture	Positive	Negative
Response to ATT	Good (definitive)	None
Colonoscopy	Pseudopolyps, short segment, ileocaecal valve deformed	Cobblestone, skip lesions

PART 10 - TUBERCULOSIS AND SURGERY

Surgical Indications in TB

Pulmonary TB Surgery:

Destroyed lung/lobe (massive haemoptysis, persistent cavity, bronchiectasis)
Diagnostic thoracotomy/VATS (persistent diagnosis uncertainty)
Empyema necessitatis drainage
Drug-resistant TB - adjunct to chemotherapy (segmentectomy/lobectomy/pneumonectomy for localized MDR-TB)
Bronchopleural fistula

Spinal TB (Pott's Disease) - Surgery:

Indications: Cord compression (neurological deficit), instability, abscess not responding to ATT, kyphotic deformity >40°
Procedure: Anterior decompression + fusion (gold standard) or posterolateral approach
Cold abscess: drain if large, fluctuant or threatening vital structures

Abdominal TB Surgery:

Intestinal obstruction (not responding to conservative management)
Perforation: ileostomy/resection
Bleeding: resection
Diagnostic uncertainty (can't exclude carcinoma)

Lymph Node TB Surgery:

Aspiration of fluctuant nodes for diagnosis
Excision biopsy for diagnosis
Avoid incision and drainage (risk of chronic sinus formation)

Pericardial TB Surgery:

Pericardiectomy for constrictive pericarditis

Genitourinary TB Surgery:

Nephrectomy for non-functioning kidney
Ureteric stenting for strictures
Augmentation cystoplasty for contracted bladder

Post-Surgical Management:

Continue full course of ATT irrespective of surgery
Surgery is adjunct, not replacement, for chemotherapy

PART 11 - BOVINE TUBERCULOSIS

Agent

Mycobacterium bovis (M. bovis) - closely related to M. tuberculosis
Member of M. tuberculosis complex
Reservoir: cattle, badgers, deer
Transmission to humans: ingestion of unpasteurized milk or milk products, direct contact with infected animals, inhalation in abattoir workers

Clinical Features in Humans

Feature	Bovine TB (M. bovis)
Mode of infection	Oral (milk) > inhalation > direct contact
Primary site	GI tract (cervical/mesenteric lymph nodes), bone
Pulmonary disease	Less common (but can occur)
Extrapulmonary	Common - lymph nodes (scrofula), bone, GI, skin
Drug resistance	Intrinsically resistant to Pyrazinamide
Treatment	HRZE for 6 months (no pyrazinamide for first 2 months, use HRE+S instead; 9 months total)
Diagnosis	Culture on LJ: small, rough, buff-coloured colonies; no pyrazinamide susceptibility

Pakistan Relevance:

Very prevalent in cattle-rearing communities (Punjab, Sindh rural)
Unpasteurized doodh (milk) consumption widespread
Cervical lymphadenopathy (scrofula) in children often due to M. bovis

Treatment for Bovine TB:

9HRE (no PZA - intrinsic resistance) OR 2HRSE / 7HRE

PART 12 - LATENT TB INFECTION (LTBI)

Definition

Positive TST or IGRA with:

No symptoms
Normal CXR
No bacteriological evidence of active disease

Who to Test for LTBI (Pakistan NTP + WHO)

Household contacts of smear-positive PTB (especially children <5)
HIV-positive individuals
Patients on anti-TNF therapy
Transplant candidates
Healthcare workers

LTBI Treatment Regimens (Harrison's 22e, 2025)

Regimen	Schedule	Duration	Preferred Use
3HP - Isoniazid + Rifapentine	900 mg each weekly (>50kg)	3 months (12 doses)	First choice (all adults, HIV+/-)
4R - Rifampicin	600 mg daily	4 months	HIV-negative, children
3HR - INH + Rifampicin	Daily	3 months	Alternative
6H/9H - Isoniazid	300 mg daily or 900 mg twice weekly	6-9 months	Alternative; 9 months more effective

Pakistan context: 6H (isoniazid monotherapy x 6 months) is standard for household child contacts in NTP program due to availability.

Household Contact Management Protocol

"INVESTIGATE - TREAT - PREVENT"

All contacts - clinical assessment + CXR
Children <5 years: If TST/IGRA not available - give isoniazid prophylaxis directly
Children <5 with symptoms or CXR abnormality - treat as active TB
Immunocompromised (HIV+) - treat LTBI regardless of TST
TST+ contacts with no active disease - LTBI regimen
BCG vaccination - for unvaccinated contacts <5 (after LTBI treatment)

PART 13 - COUNSELLING FAMILY/HOUSEHOLD CONTACTS

What to Tell the Family

Mnemonic: "COACH"

C - Contagion (how TB spreads - droplet, NOT touch, sharing utensils) O - Open treatment (importance of full course, DOT) A - All contacts tested (especially children, elderly, HIV+) C - Characteristics to watch (cough >2 weeks, fever, weight loss) H - Healthy habits (ventilation, sunlight, nutrition, BCG for newborns)

Key Counselling Points

TB is curable - complete treatment is essential
Patient is non-infectious after 2 weeks of effective therapy (smear-negative) - can return to work/school
Isolation at home during initial intensive phase (2 weeks) - separate room, open windows
DOT (Directly Observed Therapy) - watch patient swallow medication daily
No alcohol (increases hepatotoxicity risk)
Report side effects immediately: yellow eyes (hepatitis), visual blurring (ethambutol)
All household members must be screened (including children)
BCG vaccination for newborns
Nutritional support - high protein diet, vitamin supplementation

PART 14 - EMERGENCIES IN TUBERCULOSIS

Mnemonic: "MASH-PP" (TB Emergencies)

M - Massive Haemoptysis A - Airway obstruction (lymph node compression) S - SIADH / Hyponatraemia (TBM) H - Hydrocephalus (TBM) P - Pneumothorax P - Pericardial Tamponade

1. Massive Haemoptysis

Definition: >600 mL/24h or haemodynamically significant
Causes: Rasmussen's aneurysm (pulmonary artery erosion in cavity), aspergilloma in old TB cavity, bronchiectasis
Management: ABC, Patient on bleeding side, intubation, bronchoscopy, bronchial artery embolisation (BAE), emergency surgery

2. Airway Obstruction

Lymph node compression in primary TB (children)
Endobronchial TB
Management: Bronchoscopy, corticosteroids, emergency stenting

3. TB Meningitis Emergencies

Hydrocephalus: urgent VP shunt or external ventricular drainage
SIADH/Hyponatraemia: fluid restrict, hypertonic saline if severe
Seizures: anticonvulsants (note drug interactions with rifampicin)
Cerebral herniation: mannitol, head elevation, dexamethasone

4. Pneumothorax

Spontaneous in cavitary disease or bronchopleural fistula
Tension pneumothorax: emergency needle decompression, chest tube

5. Cardiac Tamponade (TB Pericarditis)

Emergency pericardiocentesis
Then start ATT + prednisolone

6. Adrenal Crisis (TB Adrenalitis - Addison's Disease)

Bilateral adrenal destruction by TB (most common cause of Addison's in Pakistan)
Emergency: IV hydrocortisone 100 mg stat + fluid resuscitation

7. Liver Failure (Drug-Induced - DILI)

Stop all four drugs if bilirubin >3 or ALT >5x normal
Restart sequentially: R first, then H, then Z
If severe DILI: use Streptomycin + Ethambutol + Fluoroquinolone as bridge

8. Paradoxical Reactions (IRIS)

Worsening of TB lesions after starting ATT (immune reconstitution)
Common in HIV+ patients starting ART
Management: Continue ATT/ART, add NSAIDs or prednisolone

PART 15 - PAKISTAN NTP & LOCAL PROTOCOLS

National TB Control Programme (NTP Pakistan)

Current Structure (2024-2026):

Free diagnosis and treatment at all government facilities
TB treatment integrated with PHC (Basic Health Units - BHUs, Rural Health Centres - RHCs)
GeneXpert at district-level and above
Directly Observed Therapy (DOT) at all levels
Community-based DOT via community health workers (Lady Health Workers - LHWs)
Private sector engagement through Public-Private Mix (PPM)

Pakistan Chest Society (PCS) TB Guidelines 2020

Category	Patients	Regimen
Category I (New)	New PTB smear+, new severe EPTB	2HRZE/4HR
Category II (Retreatment)	Relapse, treatment after failure, treatment after LTFU	2HRZES/1HRZE/5HRE
Category III (New, less severe)	New PTB smear-, new less severe EPTB	2HRZ/4HR
DR-TB	GeneXpert Rif-R or DST confirmed	Individualized per WHO Groups A/B/C

Recent Pakistan NTP Updates 2023-2025

BPaL/BPaLM rollout: Piloted at 4 sites (Rawalpindi, Multan, Lahore, Peshawar) - now being expanded. Pakistan updated DR-TB guidelines to include 6-month all-oral regimens.
Pretomanid availability: TB Alliance licensed Remington Pharmaceuticals (Pakistan) to manufacture Pretomanid.
CBNAAT XDR test: NTP plans to introduce GeneXpert MTB/XDR cartridges at equipped labs (detects H, FQ, SLI, Eto resistance rapidly).
Shorter MDR-TB regimen (9-11 months): Being implemented with Linezolid replacing Ethionamide.
GeneXpert expansion: Hundreds of GeneXpert machines now operational; Universal DST policy being implemented.
PMDT (Programmatic Management of Drug-Resistant TB): Centres in all provincial capitals and major cities.

Comparison: Pakistan NTP vs WHO vs International (2024-2025)

Aspect	Pakistan NTP	WHO 2022	UK/NICE	USA CDC
DS-TB regimen	2HRZE/4HR	2HRZE/4HR	2HRZE/4HR	2HRZE/4HR
Shorter regimen	Not yet mainstream	2HPZM/2HPM (4 months) available	NICE TG33 2024	TB Trials Consortium
MDR-TB preferred	BPaLM (rolling out)	BPaLM (Group A+B)	BPaLM commissioning 2024	BPaL/BPaLM 2023
LTBI preferred	6H (children), 3HP adults	3HP or 4R	3HP or 3HR	3HP
DOT policy	Mandatory	Recommended	Selective	Selective
Category II (retreatment)	2HRZES/1HRZE/5HRE	DST-guided preferred	DST-guided	DST-guided
IGRA vs TST	TST preferred (cost)	Either	IGRA preferred	IGRA preferred

Key Difference: Pakistan NTP still uses Category II regimen (HRZES) for retreatment in resource-limited settings where DST is not yet universally available, whereas WHO now recommends DST-guided individualized treatment for all retreatment cases.

PART 16 - RECENT ADVANCES (2022-2026)

Diagnosis

TB-LAM (Lipoarabinomannan) urine test: Alere Determine TB LAM Ag - for HIV+ with low CD4; WHO recommends as point-of-care test
GeneXpert Ultra: Higher sensitivity for paucibacillary disease (>10% better than original Xpert)
GeneXpert XDR cartridge: Detects resistance to INH, FQ, aminoglycosides, ethionamide in 90 minutes
CLIA (Chemiluminescent immunoassay) IGRA: Automation improving throughput

Treatment

BPaL/BPaLM regimen (6 months for MDR/XDR-TB): Game-changing; ZeNix trial showed optimal Lzd dose 600 mg
TB Preventive Therapy (TPT) expansion: WHO push for 3HP globally including Pakistan
Shorter DS-TB regimens: TRUNCATE-TB trial (2022) - 8-week ultra-short regimens; SHINE trial (2020) - 4 months for smear-negative non-cavitary
4-month DS-TB regimen (2HPZM/2HPM): Rifapentine + moxifloxacin + PZA + INH; now available as option in some guidelines (Study 31/A5349 - NEJM 2021)
Delamanid in children <6: WHO recommends for RR-TB in younger children
Injectable-free MDR-TB regimens: WHO 2022 moved all injectables to Group C (last resort)

Vaccines

M72/AS01E: Phase 2b trial showed 50% efficacy in latent TB; Phase 3 now underway
BCG revaccination: REVAC-B+C trial in adolescents showed benefit in some populations

PART 17 - DIAGNOSTIC APPROACH BY SITE

TB Meningitis Diagnosis

LP: Turbid/clear/xanthochromic CSF; lymphocytic pleocytosis (100-500 cells); high protein (1-5 g/L); low glucose (<45 mg/dL or CSF:serum glucose <0.5)
ADA elevated
India ink negative (differentiates from cryptococcal meningitis)
GeneXpert on CSF (sensitivity ~60-80%)
Culture (gold standard - 6-8 weeks)
MRI: Basal meningeal enhancement, hydrocephalus, infarcts (common)

TB Meningitis Staging (British Medical Research Council):

Stage	Features
I	Fully conscious, no focal deficit
II	Altered consciousness or focal deficit
III	Coma or dense focal deficits

Pleural TB Diagnosis

Thoracocentesis: Exudate (Light's criteria), lymphocytic (>70%), ADA >40 IU/L
Pleural biopsy (Abrams): Caseating granuloma (most sensitive histological test)
GeneXpert on pleural fluid: low sensitivity (~16-50%)
Culture of pleural fluid: low yield

Pericardial TB Diagnosis

Echo: Effusion, pericardial thickening, constrictive pattern
Pericardiocentesis: Exudate, ADA elevated
Pericardial biopsy: Caseating granuloma

Genitourinary TB Diagnosis

"Sterile pyuria" (urine WBC positive, routine culture negative)
EMU (Early Morning Urine) x 3 for AFB culture
IVP/CT urogram: Irregular calices, "beaded" ureter, strictures, autonephrectomy
Cystoscopy: "Golf hole" ureteric orifice (fibrosis)

QUICK REVISION MNEMONICS SUMMARY

Topic	Mnemonic
First-line drugs	RIPE (Rifampicin, Isoniazid, Pyrazinamide, Ethambutol)
Standard regimen	2 RIPE / 4 RI
Side effects - INH	INH = Neuropathy (needs B6) + Hepatitis
Side effects - Ethambutol	Ethambutol = Eyes (optic neuritis)
Side effects - Rifampicin	Red/Orange urine, Rifampicin Revs up liver (induces CYP)
Side effects - PZA	Pain in Ze joints (arthralgia + gout)
QT-prolonging TB drugs	BeDa MoL Clo (Bedaquiline, Delamanid, Moxifloxacin, Linezolid, Clofazimine)
TB emergencies	MASH-PP (Massive haemoptysis, Airway obstruction, SIADH, Hydrocephalus, Pneumothorax, Pericardial tamponade)
History taking	SWIFT-PAST
Family counselling	COACH
BPaLM drugs	Bedaquiline + Pretomanid + Linezolid + Moxifloxacin

SOURCES

All clinical content synthesized from:

Murray & Nadel's Textbook of Respiratory Medicine (9780323655873) - TB Chapters 53, 54
Harrison's Principles of Internal Medicine 22E (2025, McGraw Hill) - Chapter 186, p. 1457-1522
S. Das Manual on Clinical Surgery, 13th Edition - Abdominal TB
Sleisenger & Fordtran's GI and Liver Disease - Intestinal/Peritoneal TB
Lippincott Illustrated Reviews: Pharmacology - TB drug mechanisms
Red Book 2021 (AAP) - Paediatric TB treatment regimens
Pakistan Chest Society (PCS) TB Guidelines 2020 - pakistanchestsociety.pk
WHO Global TB Report 2025 - who.int
SAARC TB Fact Sheet 2024 - saarctb.org
Pakistan's path forward in DR-TB management: BPaL/BPaLM - Ann Med Surg 2025
TB-DM comorbidity Pakistan (PMID 38346381), BCGosis (PMID 41459544)

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