Asking for Preferences

Which question(s) would you like me to answer?

This is an ENT (Otorhinolaryngology) exam paper. I'll read the medical library skill first, then research all 16 topics in parallel.

Reading File

Now I'll search for all topics in parallel to maximize coverage within my budget:

Finding Sources

Good - there are ENT books. Let me find them:

Finding Sources

I've reached my query_library_db limit. I have good contextual knowledge of all these ENT topics. Let me now write comprehensive answers for all 16 questions using my extensive medical knowledge, supplemented by what I've found.Here are comprehensive answers to all 16 questions:

ENT Exam - Complete Answers

LONG ESSAY (10 Marks)

Q1. Surgical Management of CSOM (Chronic Suppurative Otitis Media)

Definition: CSOM is a chronic inflammation of the middle ear and mastoid with persistent discharge through a tympanic membrane perforation for more than 2-3 months.

Types:

Tubotympanic (Safe/Mucosal) type - central perforation, no cholesteatoma
Atticoantral (Unsafe/Squamous) type - marginal/attic perforation, cholesteatoma present

Principles of Surgical Management: The goals are: eradicate disease, create a dry ear, prevent complications, and restore hearing.

I. Surgery for Tubotympanic CSOM

A. Myringoplasty (Type I Tympanoplasty)

Repair of TM perforation only, ossicular chain intact
Graft materials: temporalis fascia (most common), perichondrium, fat
Approaches: underlay (subepithelial) or overlay (epithelial)
Performed when ear is dry for 6+ weeks
Success rate: 85-90%

B. Tympanoplasty (Type I-V)

Wullstein's classification:
- Type I: Myringoplasty only
- Type II: Graft onto incus (when malleus absent)
- Type III: Graft onto stapes head (columella effect)
- Type IV: Graft over mobile stapes footplate
- Type V: Fenestration of horizontal semicircular canal

C. Ossiculoplasty: Reconstruction of ossicular chain using autograft (incus), homograft, or PORP/TORP (partial/total ossicular replacement prosthesis).

II. Surgery for Atticoantral CSOM (Cholesteatoma)

A. Mastoidectomy Types:

1. Cortical (Simple) Mastoidectomy

Removes mastoid air cells while preserving posterior canal wall
Used for acute mastoiditis, acute coalescent mastoiditis
All three surgical canals (mastoid antrum, aditus, posterior wall of EAC) left intact

2. Modified Radical Mastoidectomy (MRM)

Removes posterior meatal wall, externalizes mastoid cavity
Attic, antrum and mastoid exenterated
Middle ear partially preserved (ossicles and TM remnant)
Canal wall down procedure
Best for contained/limited atticoantral disease
Hearing better preserved than in radical

3. Radical Mastoidectomy

Complete removal of middle ear contents + mastoid
Entire canal wall removed
Creates a large open cavity (mastoid bowl)
Eustachian tube orifice obliterated
Reserved for extensive disease, malignancy, or failed previous surgery
Results in maximum conductive hearing loss (50-60 dB)

4. Canal Wall Up (Intact Canal Wall) Mastoidectomy

Posterior tympanotomy approach
Preserves posterior meatal wall
Better hearing outcomes, lower cavity problems
Higher recurrence/residual cholesteatoma risk (10-20%)
Requires second-look surgery at 12 months

5. Atticotomy / Epitympanotomy

Limited surgery for attic cholesteatoma
Removal of lateral attic wall
Can be combined with tympanoplasty

III. Mastoid Obliteration

Used after canal wall down surgery
Obliterates the mastoid bowl using: abdominal fat, temporalis muscle flap, bone pate
Reduces cavity size, decreases cleaning requirements

IV. Combined Approach Tympanoplasty (CAT)

Introduced by Jansen
Stage 1: Cortical mastoidectomy + tympanoplasty
Stage 2 (12 months later): Second-look, reconstruct ossicles
Best hearing results with lowest recurrence

V. Complications of Surgery:

Facial nerve palsy
Sensorineural hearing loss
Labyrinthitis / perilymph fistula
CSF leak / meningitis
Persistent cavity problems (wet mastoid bowl)
Recurrent/residual cholesteatoma

Post-operative Care:

Ear dry for 6 weeks
Ear drops (antibiotic + steroid)
Regular aural toilet
Audiological review
Cavity cleaning (for open cavity procedures)

SHORT ESSAYS (5 Marks each)

Q2. Acute & Chronic Rhinosinusitis and Their Complications

Definitions:

Acute: Symptoms <12 weeks with complete resolution
Chronic: Symptoms >12 weeks without complete resolution; may have acute exacerbations

Rhinosinusitis: Inflammation of mucosa of nose and one or more paranasal sinuses (PNS).

Classification (EPOS):

Acute (<12 weeks): viral (common cold <10 days), post-viral (>10 days improvement then worsen), bacterial
Chronic (>12 weeks): with or without nasal polyps

Acute Rhinosinusitis - Features:

Nasal obstruction, mucopurulent discharge (anterior/posterior)
Facial pain/pressure (worse on bending)
Reduction of smell, fever
Maxillary most commonly involved

Causative organisms (acute bacterial): Streptococcus pneumoniae, H. influenzae, Moraxella catarrhalis

Chronic Rhinosinusitis - Features:

Nasal blockage, nasal discharge
Facial pain (mild/pressure), hyposmia
2 or more symptoms >12 weeks
Confirmed by: nasal endoscopy, CT PNS

Management:

Acute: saline irrigation, intranasal steroids, analgesics; antibiotics (amoxicillin) if bacterial
Chronic: topical steroids (mainstay), saline irrigation, oral steroids (short course), long-term macrolides; surgery (FESS) for refractory cases

Complications of Rhinosinusitis:

Orbital Complications (most common - ethmoid sinus): Chandler's Classification:

Preseptal (periorbital) cellulitis - anterior to orbital septum
Orbital cellulitis - posterior to orbital septum
Subperiosteal abscess - between periorbita and orbital wall
Orbital abscess - within orbit
Cavernous sinus thrombosis - most severe, bilateral proptosis

Intracranial Complications:

Meningitis (most common intracranial complication)
Extradural abscess
Subdural empyema
Brain abscess (frontal lobe - from frontal sinusitis)
Cavernous sinus thrombosis
Superior sagittal sinus thrombosis

Bony Complications:

Osteomyelitis of frontal bone = Pott's puffy tumor (fluctuant forehead swelling)
Orbital roof erosion

Mucocele / Mucopyocele: Accumulation of mucus expanding sinus (usually frontal or ethmoid) - causes bony expansion, proptosis

Q3. Congenital Lesions of the Larynx

Introduction: Present at birth; may cause stridor, respiratory distress, dysphagia.

Classification:

1. Laryngomalacia (Most common - 75% of all congenital stridor)

Immature, omega-shaped epiglottis + short aryepiglottic folds
Inspiratory stridor, worse when supine, crying, feeding
"Crowing" sound
Usually self-resolving by 12-18 months
Surgery: supraglottoplasty for severe cases (failure to thrive, apnea)

2. Vocal Cord Paralysis (2nd most common)

Unilateral: hoarse cry, aspiration (often due to birth trauma, cardiovascular anomalies)
Bilateral: respiratory distress, stridor (more dangerous); causes include CNS lesions (Arnold-Chiari), birth trauma
Management: unilateral - observe; bilateral - may need tracheostomy; thyroplasty later

3. Subglottic Stenosis (SGS)

Congenital or acquired (post-intubation)
Congenital: incomplete canalization; normal cricoid ring <4mm in term neonate
Biphasic stridor
Classified by Myer-Cotton grading (I-IV)
Treatment: balloon dilation, laryngotracheal reconstruction (LTR), cricotracheal resection

4. Laryngeal Webs

Failure of recanalization (6th-10th week of fetal life)
Mostly anterior (75%)
Thin web: dysphonia, mild stridor
Thick web: respiratory distress
Cohen classification: Grade I-IV
Treatment: endoscopic division (thin), keel insertion, laryngotracheal reconstruction

5. Subglottic Hemangioma

Presents 2-3 months of life (as hemangioma enlarges)
Biphasic stridor, 50% have skin hemangiomas
"Asymmetric subglottic narrowing" on X-ray
Treatment: propranolol (first-line), CO2 laser, steroids, tracheostomy if severe

6. Laryngeal Atresia / Aplasia

Rare, incompatible with life unless immediately managed with tracheostomy

7. Posterior Laryngeal Cleft

Incomplete fusion of posterior cricoid lamina
Ranges from small interarytenoid cleft to total laryngotracheoesophageal cleft
Presents with aspiration, recurrent pneumonia, choking
Diagnosed by direct laryngoscopy
Treatment: endoscopic repair (Type I/II), open surgery (Type III/IV)

8. Bifid Epiglottis

Rare, associated with Pallister-Hall syndrome
Usually asymptomatic

Q4. Otosclerosis

Definition: A disease of labyrinthine capsule (otic capsule) characterized by abnormal bone remodeling, where normal endochondral bone is replaced by spongy vascular bone (spongiosis).

Epidemiology:

Most common cause of progressive conductive hearing loss in young adults (15-45 yrs)
Female > Male (2:1)
Bilateral in 70-80% (one ear usually worse)
Autosomal dominant with incomplete penetrance (25-40%)
Whites > Blacks > Asians

Etiology: Genetic (multifactorial), measles virus (? role), fluoride deficiency, estrogen influence (worsens in pregnancy)

Pathology:

Fixation of stapes footplate at oval window (most common site = fissula ante fenestram)
Causes conductive hearing loss
If cochlear (cochlear otosclerosis): sensorineural hearing loss component

Clinical Features:

Insidious, progressive conductive hearing loss
Bilateral, usually asymmetric
Paracusis Willisii: hears better in noisy environments (due to others speaking louder)
Tinnitus (low frequency)
TM normal
Schwartze sign: flamingo pink blush seen through TM = active disease (hypervascular focus)

Audiological Findings:

Conductive hearing loss (low frequency first)
Carhart's notch: dip at 2000 Hz in bone conduction
Type As (stiffness) tympanogram - flat or reduced compliance
Absent stapedial reflexes
If cochlear: mixed or pure SNHL

Diagnosis: Clinical + audiometry; HRCT temporal bone (halo sign around cochlea, footplate thickening)

Treatment:

Medical:

Sodium fluoride: stabilizes otosclerosis (fluoride theory); 25 mg/day
Bisphosphonates
Not curative; slows progression

Surgical (Stapedectomy / Stapedotomy):

Stapedotomy (preferred): Small fenestra (0.6-0.8 mm) drilled in footplate; piston (Teflon/stainless steel) placed from incus to oval window
Stapedectomy: Total footplate removal + tissue graft + piston
Success: 90-95% closure of air-bone gap to <10 dB
Risks: dead ear (1%), SNHL (1-2%), perilymph fistula, tinnitus, taste disturbance (chorda tympani)
Contraindications: only hearing ear, active infection, endolymphatic hydrops

Hearing Aid: For bilateral disease, poor surgical candidate, cochlear otosclerosis component

Q5. Deviated Nasal Septum (DNS)

Definition: Displacement of the nasal septum from the midline, resulting in unequal nasal passages.

Anatomy: Septum composed of: perpendicular plate of ethmoid (upper), vomer (lower posterior), quadrilateral cartilage (anterior), nasal crest of maxilla and palatine bone.

Etiology:

Birth trauma (most common cause in neonates)
Developmental (unequal growth of septal components during puberty)
Trauma (fractures)
Intrinsic growth disturbances (Killian's theory)

Types of Deviation:

C-shaped (simple curvature to one side)
S-shaped (bilateral involvement)
Dislocation from groove of vomer/maxillary crest
Deviation with spur (bony projection at junction of bone and cartilage)
Thickening or ridge
Combination

Clinical Features:

Nasal obstruction (unilateral or bilateral; may alternate due to nasal cycle)
Compensatory hypertrophy of inferior turbinate on opposite side
Headache (spur pressing on turbinate = contact headache / Sluder's neuralgia)
Epistaxis (due to dryness at spur / deviation)
Sinusitis (due to ostial blockage)
Anosmia/hyposmia
Snoring and sleep apnea

Examination: Anterior rhinoscopy: deflection, spur, ridge; Nasal endoscopy; CT PNS for pre-surgical planning

Medical Management: Topical decongestants, saline irrigation, intranasal steroids (for associated mucosal inflammation)

Surgical Management:

1. Septoplasty (SMR = Submucous Resection - Killian's operation):

Incision: hemitransfixion or Killian's incision
Mucoperichondrial flaps elevated
Deviated cartilage/bone removed or repositioned
Mucosal flaps replaced
Advantage over SMR: preserves cartilage (maintains support)

2. Submucous Resection (SMR - older technique):

More cartilage removed; may cause saddle nose deformity
Replaced largely by septoplasty

3. Septorhinoplasty: When external cosmetic deformity also present

Complications of Surgery:

Septal hematoma/abscess
Septal perforation
Saddle nose deformity (loss of dorsal support)
Epistaxis
Anosmia
Synechiae (adhesions)
CSF rhinorrhea (rare)

Post-op: Nasal packing for 24-48 hours; saline douching; splint if rhinoplasty done

Q6. Acoustic Neuroma and Its Management

Definition: Benign, slow-growing tumor arising from Schwann cells of the vestibular portion (most often superior vestibular nerve) of CN VIII. Also called vestibular schwannoma.

Epidemiology:

Most common CPA (cerebellopontine angle) tumor (80-90% of CPA tumors)
Bilateral = Neurofibromatosis type 2 (NF2 - mutation on chromosome 22)
Peak age: 40-60 years; F slightly > M
Unilateral in 95% of cases

Pathology:

Antoni A tissue (compact, ordered Schwann cells) and Antoni B tissue (loose myxoid)
Verocay bodies (palisaded nuclei) in Antoni A areas

Clinical Features (depend on size):

Small tumor (intracanalicular): Unilateral SNHL (most common symptom), tinnitus (high frequency), mild disequilibrium
Medium tumor: Progressive SNHL, vestibular dysfunction, fullness in ear
Large tumor: Facial nerve involvement (late - because facial nerve is resistant), trigeminal symptoms (numbness/pain), cerebellar ataxia
Very large tumor: Raised ICP (hydrocephalus), brainstem compression, dysphagia

Investigations:

Pure Tone Audiometry: high-frequency SNHL; poor speech discrimination
ABR (Auditory Brainstem Response): increased interwave latency I-III and I-V; screening test
MRI with gadolinium (gold standard): enhancing lesion in IAC/CPA
CT: widening of IAC

Koos Classification (staging):

Grade I: intracanalicular
Grade II: in CPA but <2 cm, not touching brainstem
Grade III: touching brainstem
Grade IV: compressing brainstem

Management:

1. Watch and Wait (Observation):

Elderly, small tumor (<1.5 cm), poor health, single hearing ear
Annual MRI for 5 years, then biannual
~40-50% show no growth over time

2. Surgical Resection: Three main approaches:

Translabyrinthine approach: Best for large tumors, no functional hearing; sacrifices hearing; best facial nerve visualization; no brain retraction
Middle cranial fossa approach: Small intracanalicular tumors with good hearing; hearing preservation possible
Retrosigmoid (suboccipital) approach: Any size; hearing preservation possible; risk of cerebellar retraction, headache

Aim: total tumor removal with facial nerve preservation (House-Brackmann scale used to grade facial function)

3. Stereotactic Radiosurgery (Gamma Knife / CyberKnife):

For small to medium tumors (<3 cm)
Elderly patients, poor surgical candidate
Hearing preservation better than surgery for small tumors
Local control rate: 90-95% at 10 years
Risks: temporary facial weakness, trigeminal numbness

Facial Nerve Monitoring: Intraoperative continuous EMG monitoring mandatory

Q7. Tumors of Nasopharynx - JNA (Juvenile Nasopharyngeal Angiofibroma)

Definition: JNA is a rare, benign but locally aggressive, highly vascular fibrous tumor arising from the posterolateral wall of the nasopharynx, specifically from the pterygopalatine fossa near the sphenopalatine foramen.

Epidemiology:

Almost exclusively in adolescent males (10-25 years)
"The bleed that must not be biopsied" - extreme vascularity causes massive hemorrhage on biopsy
Constitutes 0.05% of all head and neck tumors

Blood Supply: Internal maxillary artery (external carotid system) primarily; may also receive from internal carotid

Pathology:

Fibroblasts + thin-walled vascular spaces (no smooth muscle in vessel walls = cannot contract = bleeds profusely)
Unencapsulated

Clinical Features:

Massive, recurrent, spontaneous epistaxis (hallmark) - unilateral at first
Progressive nasal obstruction (unilateral)
Nasal discharge, anosmia
Conductive hearing loss (Eustachian tube obstruction)
Extension: cheek swelling (pterygopalatine fossa), proptosis (orbit), cranial nerve palsies, intracranial extension

Investigations:

CT with contrast: "Antral sign" - anterior bowing of posterior wall of maxillary sinus (pathognomonic)
MRI: "Salt and pepper" appearance (flow voids)
Angiography: highly vascular blush; used for pre-operative embolization
Holman-Miller sign on CT (anterior displacement of posterior maxillary sinus wall)
Do NOT biopsy in clinic

Staging - Andrews/Fisch/Session Classification:

Stage I: Nasopharynx/nasal cavity
Stage II: Paranasal sinuses, pterygopalatine fossa, orbit (without intracranial)
Stage III: Intracranial extradural
Stage IV: Intracranial intradural / cavernous sinus

Management:

Pre-operative embolization: 24-48 hours before surgery to reduce blood loss (blocks external carotid feeders)

Surgery (mainstay):

Endoscopic approach (preferred for Stage I/II): FESS-based endoscopic resection; lower morbidity, comparable recurrence
Open approaches:
- Transpalatal (Rowe - for limited tumors)
- Lateral rhinotomy + medial maxillectomy (moderate)
- Infratemporal fossa approach (large Stage III)
- Combined craniofacial (intracranial extension)

Radiotherapy: Used for intracranial or unresectable tumors; 30-36 Gy; risk of radiation-induced malignancy in young patients

Hormone therapy (testosterone blockade): Historically tried; not standard now

Recurrence: Up to 20%; due to incomplete resection; requires repeat surgery

Q8. Congenital Anomalies of Nose and PNS

Embryology: Nose develops from frontonasal process and nasal placodes (5th week). Choanae form when oronasal membrane ruptures (7th week). PNS develop as outgrowths of nasal cavity mucosa.

A. Congenital Anomalies of Nose:

1. Choanal Atresia (Most important)

Failure of oronasal membrane to rupture (7th week of fetal life)
Incidence: 1 in 7000-8000 births
F > M; Right side > Left side
Unilateral (50%): presents later with persistent unilateral discharge
Bilateral (50%): presents at birth with respiratory distress (newborns are obligate nasal breathers)
- "Cyclic cyanosis": cyanosis relieved by crying (mouth breathing)
- Fails to pass 6F catheter through nose
Associated anomalies: CHARGE syndrome (Coloboma, Heart defects, Atresia choanae, Retarded growth, Genital hypoplasia, Ear anomalies)
Types: bony (90%) + membranous (10%)
Diagnosis: CT scan (gold standard)
Treatment: bilateral = airway (McGovern nipple or oral airway), then surgical repair; transnasal endoscopic approach preferred; transpalatal (for thick bony atresia)

2. Pyriform Aperture Stenosis

Narrowing of bony pyriform aperture
Bilateral: neonatal respiratory distress
Associated with holoprosencephaly, single central maxillary incisor
CT confirms

3. Proboscis / Arhinia

Very rare; absent or rudimentary nose
Associated with brain anomalies

4. Nasal Dermoid

Pit or cyst on dorsum of nose
Can extend intracranially
Risk: pit with hair on dorsal nose = rule out intracranial extension with MRI before surgery
Treatment: surgical excision

5. Nasal Glioma

Heterotopic CNS tissue; no communication with CSF (unlike encephalocele)
Firm, non-compressible, non-pulsatile; does not enlarge with crying
60% extranasal (over bridge of nose), 30% intranasal, 10% both
MRI to assess intracranial connection
Treatment: surgical excision

6. Nasal Encephalocele

Herniation of meninges ± brain tissue through skull defect
Compressible, pulsatile; enlarges on crying (Furstenburg test positive)
Transilluminates
MRI mandatory; DO NOT biopsy
Types: sincipital (frontoethmoidal), basal (through cribriform plate)
Treatment: neurosurgical repair (combined approach)

B. Congenital Anomalies of PNS:

1. Hypoplasia/Aplasia of sinuses

Maxillary sinus most commonly affected
Usually incidental finding
May predispose to sinusitis

2. Nasal Polyps in childhood

Always investigate for cystic fibrosis (bilateral polyps in child under 12 years)
Sweat test, genetic testing

3. Mucocele

Can be congenital due to obstruction of sinus ostium

SHORT ANSWERS (3 Marks each)

Q9. Nasal Polyposis

Definition: Multiple, bilateral, smooth, pale, gelatinous, non-tender, insensitive polyps arising from the ethmoidal sinuses (middle meatus), representing edematous protrusions of sinus mucosa.

Etiology/Associations:

Chronic rhinosinusitis (most common cause)
Allergy (atopy)
Aspirin sensitivity triad (Samter's triad): nasal polyps + aspirin sensitivity + bronchial asthma
Cystic fibrosis (in children - always screen)
Kartagener syndrome (immotile cilia)

Pathology: Edematous mucosa + eosinophilic infiltrate; goblet cell hyperplasia; basement membrane thickening

Clinical Features:

Bilateral nasal obstruction (characteristic)
Anosmia/hyposmia (olfactory polyps)
Rhinorrhea (watery/mucoid)
Snoring
Hyponasal voice
No pain (insensitive = cannot feel probe touch)

Appearance: Pale/grey, smooth, glistening, gelatinous, mobile (like "a peeled grape")

Investigations: Nasal endoscopy, CT PNS (staging), allergy testing, sweat test in children, biopsy to exclude malignancy/unilateral polyp

Staging (Meltzer): Based on CT findings (0-4)

Management:

Medical: Intranasal corticosteroids (mainstay - reduce size), short course oral steroids, saline irrigation, antihistamines (if allergic), aspirin desensitization (Samter's), biologics (dupilumab - for refractory CRS with polyps)
Surgical: FESS (Functional Endoscopic Sinus Surgery) - when medical treatment fails; removes polyps and opens sinus drainage pathways
High recurrence rate; lifelong topical steroid maintenance required

Q10. Fungal Sinusitis and Caldwell-Luc Operation

FUNGAL SINUSITIS:

Classification:

Non-invasive:
- Fungal ball (mycetoma): maxillary sinus most common; Aspergillus; unilateral; CT = hyperdense mass; treatment: FESS removal
- Allergic Fungal Rhinosinusitis (AFRS): young atopics; Bipolaris/Curvularia; thick "peanut butter" mucin; bilateral; treatment: surgery + steroids
Invasive:
- Acute fulminant (rhinocerebral) mucormycosis: diabetics, immunocompromised; Mucor/Rhizopus; rapid destruction; black eschar; very high mortality; treatment: urgent surgical debridement + IV amphotericin B + control DM/immunosuppression
- Chronic invasive: indolent, Sudan region; Aspergillus; treatment: surgical + antifungals
- Granulomatous invasive: Sudan, immunocompetent; Aspergillus flavus; proptosis

Key Point for AFRS: "Allergic mucin" - eosinophilic mucin + sparse fungal hyphae on histology; elevated total IgE; positive skin prick test to fungi

CALDWELL-LUC OPERATION:

Definition: A surgical procedure to access the maxillary sinus through an incision in the gingivobuccal sulcus (sublabial incision) above the upper premolar/molar teeth.

Steps:

Incision in the gingivobuccal sulcus (canine fossa)
Elevation of mucoperiosteal flap
Trephine through anterior wall of maxillary sinus (canine fossa)
Complete removal of diseased mucosa
Nasoantral window: counterdrainage through inferior meatus
Wound closure

Indications:

Recurrent maxillary sinusitis not responding to FESS
Maxillary sinus foreign body
Maxillary sinus tumors (radical antrostomy)
Dental cysts involving sinus
Repair of CSF rhinorrhea
Orbital floor fractures (blowout fractures)
Fungal ball of maxillary sinus (when FESS fails)
Access for JNA resection

Complications:

Facial swelling/paresthesia (infraorbital nerve injury)
Dental numbness (injury to superior dental plexus)
Oro-antral fistula
Nasolacrimal duct injury
Mucocele formation (from retained mucosa)
Osteomyelitis
Cheek paresthesia (long-term)

Q11. Meniere's Disease

Definition: An idiopathic disorder of the inner ear characterized by episodic attacks of the triad: vertigo, sensorineural hearing loss (SNHL), and tinnitus (often with aural fullness).

Pathology: Endolymphatic hydrops (distension of endolymphatic compartment) - overproduction or reduced resorption of endolymph

Clinical Features (classic triad + fullness):

Episodic vertigo: rotatory, severe, lasts 20 min to 24 hours (key: NOT seconds, NOT days)
Fluctuating SNHL: low-frequency initially; progressive; worse during attacks
Tinnitus: low-pitched, roaring/rumbling; worse before/during attacks
Aural fullness/pressure: often precedes attack

Attacks recur; between attacks patient may be normal (early) or have persistent low-frequency SNHL (later)

Audiometry:

Low-frequency SNHL (classical early finding)
Recruitment present
Type C tympanogram (if severe)
Electrocochleography (EcochG): SP/AP ratio >0.4 (summating potential elevated)
VEMP (vestibular evoked myogenic potential): reduced amplitude

Diagnosis: American Academy of Otolaryngology - Head and Neck Surgery (AAO-HNS) criteria:

Definite: 2+ spontaneous episodes vertigo >20 min + documented SNHL + tinnitus/aural fullness + no other cause
Probable: 2+ episodes dizziness + other criteria

Management:

Medical (first-line):

Salt restriction (<1.5 g/day), avoid caffeine, alcohol, stress
Diuretics: acetazolamide, hydrochlorothiazide + triamterene (reduces endolymph production)
Betahistine: improves microcirculation; 16 mg TID (most widely used)
Acute attack: vestibular sedatives (prochlorperazine, diazepam)

Intratympanic injections:

Intratympanic dexamethasone: hearing-preserving; reduces attack frequency
Intratympanic gentamicin: chemical labyrinthectomy; controls vertigo but risks SNHL; used for refractory cases

Surgical:

Endolymphatic sac decompression/shunt: hearing-preserving; modest benefit
Vestibular nerve section: hearing-preserving; highly effective for vertigo control
Labyrinthectomy: sacrifices hearing; reserved for non-serviceable hearing + intractable vertigo

Q12. Acute and Chronic Tonsillitis

ACUTE TONSILLITIS:

Definition: Acute inflammation of the palatine tonsils.

Etiology:

Viral (most common, 70-80%): adenovirus, EBV, rhinovirus
Bacterial: Group A beta-hemolytic Streptococcus (GABHS) = most important bacterial cause; also Staphylococcus, H. influenzae

Clinical Features:

Sore throat, odynophagia, dysphagia
Fever, malaise, headache
Earache (referred via Jacobson's nerve - IX)
Trismus (in peritonsillar involvement)
Enlarged, erythematous tonsils; exudate (follicular) or membrane
Cervical lymphadenopathy (jugulodigastric = tonsillar node)

Types:

Catarrhal: hyperemia only
Follicular: yellow spots on tonsillar surface (follicles)
Membranous: coalesced exudate (differentiate from diphtheria)
Ulcerative

Investigations: Throat swab culture, Rapid Strep test, Monospot (EBV), blood counts

Treatment:

Antibiotics: penicillin V 10 days (GABHS); amoxicillin (avoid if EBV - causes rash); erythromycin if penicillin-allergic
Analgesics/antipyretics, warm saline gargles, fluids
Do NOT give aspirin (Reye syndrome risk in children)

Complications: Peritonsillar abscess (quinsy), retropharyngeal abscess, parapharyngeal abscess, rheumatic fever, glomerulonephritis, otitis media, airway obstruction

CHRONIC TONSILLITIS:

Definition: Persistent tonsil infection with recurrent acute episodes or continuous low-grade infection.

Features:

Recurrent sore throats, mild dysphagia
Foul breath (halitosis) - from inspissated tonsillar debris
Caseous/cheesy material expressed from tonsillar crypts
Tonsils: enlarged or small/scarred (from repeated fibrosis)
Persistent cervical lymphadenopathy

Paradise Criteria for Tonsillectomy:

7+ episodes in 1 year, OR
5+ in each of 2 consecutive years, OR
3+ in each of 3 consecutive years
Each episode must: have T>38.3°C, cervical lymphadenopathy, tonsillar exudate, positive GABHS culture

Tonsillectomy (surgical):

Indications: chronic tonsillitis (Paradise criteria), obstructive sleep apnea, peritonsillar abscess, suspected malignancy, asymmetric tonsils
Contraindications: acute infection (wait 3 weeks), bleeding disorders, cleft palate
Techniques: dissection and snare, coblation, bipolar diathermy, laser
Complications: primary hemorrhage (<24h - reactionary 6-24h), secondary hemorrhage (5-10 days post-op - most feared), pain, dehydration

Q13. Facial Nerve Anatomy and Its Diseases

ANATOMY:

Nuclear Origin: Pons - two nuclei:

Upper nucleus (bilateral cortical supply): upper face (forehead)
Lower nucleus (contralateral supply only): lower face

Course:

1. Intracranial segment: Pons to IAC; travels with CN VIII + nervus intermedius

2. Internal Auditory Canal (IAC) segment: 7-8 mm

3. Labyrinthine segment (shortest, narrowest - 4 mm): Geniculate ganglion (first genu); branches: Greater superficial petrosal nerve (GSPN - to lacrimal gland via pterygopalatine fossa), Deep petrosal nerve

4. Tympanic (horizontal) segment: Along medial wall of middle ear above oval window; 13 mm; vulnerable in middle ear surgery; second genu

5. Mastoid (vertical/descending) segment: 13 mm; branches: Nerve to stapedius, Chorda tympani (taste anterior 2/3 tongue, submandibular/sublingual glands)

6. Extratemporal segment (beyond stylomastoid foramen): Posterior auricular nerve, branch to digastric/stylohyoid, then parotid gland; divides at pes anserinus into:

Temporofacial division: temporal, zygomatic branches
Cervicofacial division: buccal, marginal mandibular, cervical branches

FNMG (Facial Nerve Monitoring): EMG-based; used in parotid surgery, skull base surgery, mastoid surgery

DISEASES OF FACIAL NERVE:

1. Bell's Palsy (Idiopathic/most common peripheral facial palsy):

Reactivation of HSV-1 in geniculate ganglion
Sudden unilateral complete LMN palsy (forehead involved)
House-Brackmann grading: I (normal) - VI (complete paralysis)
Treatment: prednisolone (60 mg/day, 5 days then taper) + acyclovir (controversial); eye care
Prognosis: 85% complete recovery without treatment

2. Ramsay Hunt Syndrome (Herpes Zoster Oticus):

VZV reactivation in geniculate ganglion
Triad: painful herpetic vesicles in EAC/pinna + ipsilateral LMN facial palsy + sensorineural hearing loss/tinnitus/vertigo
Treatment: acyclovir (800 mg 5x/day) + prednisolone; worse prognosis than Bell's

3. Acoustic Neuroma: Facial palsy is late (nerve is displaced, not compressed early)

4. Cholesteatoma: Erodes fallopian canal; facial palsy = cholesteatoma until proven otherwise

5. Temporal bone fractures:

Transverse fracture: higher incidence of facial palsy (50%); often passes through otic capsule
Longitudinal fracture: 20% facial palsy; most common type of temporal bone fracture (80%)

6. Parotid tumors/surgery: Extratemporal segment vulnerable

7. Central vs Peripheral palsy:

Upper motor neuron (central): forehead SPARED (bilateral cortical supply to upper nucleus)
Lower motor neuron (peripheral): forehead INVOLVED

Q14. Anatomy of Ear - External, Middle and Inner Ear

EXTERNAL EAR:

Pinna (Auricle):

Fibroelastic cartilage covered by skin (no cartilage in lobule)
Key landmarks: helix, antihelix, tragus, antitragus, concha, scapha, triangular fossa, lobule
Blood supply: superficial temporal artery (anterior), posterior auricular artery (posterior)
Nerve supply: auriculotemporal (V3), great auricular (C2/C3), lesser occipital, Arnold's nerve (vagal branch CN X - auricular branch: ear-cough reflex)

External Auditory Canal (EAC):

Length: 24 mm (1 inch); S-shaped
Outer 1/3: cartilaginous (contains hair, ceruminous glands, sebaceous glands); lined by stratified squamous epithelium
Inner 2/3: bony; thinner skin (no hairs/glands); isthmus = narrowest point
Blood supply: superficial temporal + posterior auricular + deep auricular (from maxillary)
Sensory nerve supply: CN V3, VII, IX, X
Fissures of Santorini (in cartilaginous EAC - infection can spread to parotid)

Tympanic Membrane:

Cone-shaped; 9 mm diameter; faces downward, outward, forward
Pars tensa (most): 3 layers - outer squamous, middle fibrous (radial + circular), inner mucosal
Pars flaccida (Shrapnell's membrane): superior, above malleolar folds; lacks fibrous layer
Handle of malleus: visible; umbo = tip; light reflex at 5 o'clock (right), 7 o'clock (left)
Blood supply: deep auricular artery (outer), anterior tympanic (inner)

MIDDLE EAR (Tympanic Cavity):

Six walls:

Roof (tegmental): tegmen tympani (thin bone)
Floor: jugular wall (jugular bulb)
Medial: labyrinthine wall - oval window, round window, promontory, lateral semicircular canal bulge
Lateral: tympanic membrane + scutum
Anterior: carotid wall (carotid canal), Eustachian tube, tensor tympani canal
Posterior: mastoid wall - aditus ad antrum, facial nerve, pyramidal eminence

Ossicles:

Malleus: handle (manubrium), neck, head; head = epitympanum
Incus: body, short process (posterior), long process (medial wall), lenticular process (articulates with stapes head)
Stapes: head, neck, anterior/posterior crura, footplate (oval window)
Two joints: incudomalleolar, incudostapedial (lenticular process + stapes head)

Muscles: Tensor tympani (tensor - medial pterygoid n. from V3), Stapedius (smallest skeletal muscle - facial nerve CN VII)

Eustachian Tube:

35 mm long; cartilaginous (medial 2/3) + bony (lateral 1/3)
Angle: 45° adult, 10° child (horizontal - more prone to otitis media)

INNER EAR:

Bony labyrinth (contains perilymph):

Cochlea: 2.5 turns; scala vestibuli (perilymph) + scala tympani (perilymph); connected at helicotrema
Vestibule: utricle + saccule (otoliths/maculae - linear acceleration)
Semicircular canals (3): anterior, posterior, lateral; ampulla; cristae (angular acceleration)

Membranous labyrinth (contains endolymph - high K, low Na):

Cochlear duct (scala media): contains organ of Corti
Utricle and saccule: connected via utriculosaccular duct to endolymphatic duct/sac
Endolymphatic sac: in posterior fossa dura - resorbs endolymph

Organ of Corti:

Inner hair cells (3,500): primary sensory cells
Outer hair cells (12,000-15,000): amplification (prestin motor protein)
Supported by cells: Pillar cells, Deiters, Hensen, Claudius, Boettcher
Tonotopic organization: high frequency at base, low frequency at apex
Innervation: spiral ganglion (cell bodies) → cochlear nerve (CN VIII)

Blood supply: Internal auditory artery (from AICA) → common cochlear artery + anterior vestibular artery

Q15. Anatomy of Tonsil

Definition: The palatine tonsils are paired masses of lymphoid tissue located in the tonsillar fossa (between anterior and posterior pillars of fauces).

Location: Oropharynx, in the tonsillar fossa between:

Anterior pillar: palatoglossus muscle (glossopalatine arch)
Posterior pillar: palatopharyngeus muscle (pharyngopalatine arch)

Structure:

Covered by stratified squamous epithelium (continuous with oropharynx)
10-20 tonsillar crypts (invaginations) - increase surface area for immune surveillance
Fibrous capsule (incomplete) separates tonsil from underlying pharyngeal muscles
Loose areolar tissue between capsule and superior constrictor = peritonsillar space (site of peritonsillar abscess)

Relations:

Medial: oropharyngeal isthmus (only surface not covered by capsule = intratonsillar cleft)
Lateral (deep): superior constrictor muscle; then: loose areolar tissue; buccopharyngeal fascia; parapharyngeal space; styloid process; facial vessels (external carotid, lingual artery); IX, X, XI, XII
Posterior: palatopharyngeus, pharyngeal wall
Superior: soft palate
Inferior: tongue base (posterior third)

Arterial Supply (5 arteries):

Tonsillar artery (main) = branch of dorsal lingual artery (from lingual artery - external carotid)
Ascending palatine artery (from facial artery)
Descending palatine / greater palatine artery (from maxillary artery)
Ascending pharyngeal artery
Dorsal lingual artery

Most important vessel in tonsillectomy hemorrhage: external carotid artery lies lateral to tonsil

Venous Drainage: Peritonsillar plexus → pharyngeal plexus → internal jugular vein

Lymphatic Drainage: Upper deep cervical nodes (jugulodigastric node = "tonsillar node" - first to enlarge in tonsillitis)

Nerve Supply:

Glossopharyngeal nerve (CN IX - main) via tonsillar branches
Lesser palatine nerve (CN V2 via pterygopalatine ganglion)
Referred otalgia via CN IX → Jacobson's nerve → tympanic plexus

Function: Part of Waldeyer's ring (with adenoids/nasopharyngeal tonsil, tubal tonsils, lingual tonsil); B-cell and T-cell immune responses; IgA production; peaks size 4-10 years, involutes at puberty

Q16. Otostichosis / Otospongiosis

(Note: "Otostichosis" likely refers to otosclerosis/otospongiosis - a common alternate term in some curricula)

Definition: Otosclerosis (also called otospongiosis in its active phase) is a disease of the otic capsule characterized by disordered bone remodeling, where the normal dense enchondral bone of the labyrinthine capsule is replaced by abnormal spongy vascular bone. The active "otospongiosis" phase (with vascular spongy bone) progresses to the sclerotic "otosclerosis" phase (dense sclerotic bone causing fixation).

Key Points:

The term otospongiosis refers to the histological active phase: resorption + vascular spongy bone (sites appear as blue mantles = "blue mantles of Manasse" on H&E staining)
The term otosclerosis refers to the mature/sclerotic phase with bony fixation
Clinically the conditions are identical and the terms used interchangeably

Histology of Otospongiosis:

Active focus: rich vascular channels, osteoclast-mediated bone resorption, basophilic reversal lines
"Blue mantles of Manasse" = reversal lines visible on H&E
Inactive/sclerotic focus: dense lamellar bone, reduced vascularity

Differentiating Features from Standard Otosclerosis (clinical):

Schwartze sign: flamingo pink blush visible through TM = active otospongiosis (vascular focus)
CT temporal bone: halo sign (lucent halo around cochlea in cochlear otosclerosis/otospongiosis)

For full clinical features, investigations, and management, refer to Q4 (Otosclerosis) above.

If "Otostichosis" refers to a separate entity: Some texts use this term for calcification or adhesions in middle ear - but this is non-standard. The standard ENT examination term is otosclerosis/otospongiosis.

---Your credits are exhausted. You can purchase a top-up or subscribe to a plan to continue using Orris. If you're already subscribed, your daily credits will reset tomorrow.

This is a shared conversation. Sign in to Orris to start your own chat.