Please explain in a clinical way chron's disease and ulcerative colitis and their relationship. And some differences in clinical way. I am a doctor intern in a hospital. I need short compact PDF on this, short and compact handbook PDF with pictures to compare , classification,diagnosis and treatment.

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IBD Clinical Handbook
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Section 1 - Overview & Relationship

Both CD and UC fall under the IBD umbrella - chronic relapsing-remitting immune-mediated gut diseases. The key biological link is dysregulated mucosal immunity + genetic susceptibility (NOD2, HLA loci) + microbial triggers. About 10-15% of cases cannot be classified = indeterminate colitis.

The fundamental difference: CD is transmural, can affect any GI segment, and creates skip lesions; UC is mucosal, always starts in the rectum, and spreads continuously through the colon only.

Section 2 - 21-feature Clinical Comparison Table

Side-by-side comparison covering location, depth, bleeding, perianal disease, fistulae, granulomas, cobblestone mucosa, cancer risk, and surgical curability.

Section 3 - 5 Clinical Images

UC phenotypes by Montreal classification (proctitis vs left-sided vs pancolitis)
Colonoscopy: severe UC with erythema, friability, exudates
Histology: Crohn's colitis with epithelioid granulomas (key distinguishing feature)
Plain AXR: toxic megacolon (transverse colon >6 cm, loss of haustra)
MR enterography: comb sign + mural thickening in CD terminal ileum

Section 4 - Montreal Classification

UC: Extent (E1/E2/E3) + Severity (S0-S3, including the Truelove-Witts criteria for severe disease: ≥6 bloody stools/day, HR ≥90, temp ≥37.5°C, Hb <10.5)

CD: A-L-B system - Age at diagnosis (A1-A3) + Location (L1-L4) + Behavior (B1 inflammatory → B2 stricturing → B3 penetrating/fistulizing), with 'p' modifier for perianal disease.

Section 5 - Diagnostic Workup

Labs, fecal calprotectin, serology (ASCA/pANCA), colonoscopy findings, CT/MR enterography indications, and the key point: always exclude infection before starting immunosuppression.

Section 6 - Treatment

Drug classes (5-ASA, steroids, immunomodulators, anti-TNF, vedolizumab, ustekinumab, JAK inhibitors) with disease-specific step-up and top-down algorithms. Highlights the critical difference: colectomy cures UC; surgery in CD is bowel-sparing and not curative.

Section 7 - Extraintestinal Manifestations

13 manifestations across joints, skin, eyes, liver/biliary, metabolic, and vascular categories with disease association notes.

Section 8 - Monitoring & Cancer Surveillance

Routine labs, vaccination schedule, DEXA scanning, and colonoscopic surveillance timelines (UC surveillance starts 8-10 years from diagnosis; PSC + UC = annual colonoscopy from PSC diagnosis).

Sources: Sleisenger & Fordtran's GI Disease, Harrison's 22e, Goldman-Cecil Medicine, Rosen's Emergency Medicine, Sabiston Textbook of Surgery.

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IBD CLINICAL HANDBOOK

CROHN'S DISEASE vs ULCERATIVE COLITIS

Classification • Diagnosis • Treatment | For Hospital Interns

1. OVERVIEW & RELATIONSHIP

	CROHN'S DISEASE	ULCERATIVE COLITIS
GI involvement	Mouth to anus (any segment)	Colon ONLY
Inflammation depth	Transmural (all layers)	Mucosal + submucosal only
Pattern	Skip lesions (discontinuous)	Continuous from rectum proximally
Rectum	Spared in ~50%	Almost always involved (95%)
Surgery	NOT curative - disease recurs	Proctocolectomy = CURATIVE

Shared (IBD umbrella): Both are chronic relapsing-remitting immune-mediated gut diseases. Dysregulated mucosal immunity + genetic susceptibility (NOD2, HLA loci) + microbial triggers. Both carry elevated CRC risk. ~10-15% unclassifiable = Indeterminate Colitis.

2. FULL CLINICAL COMPARISON

FEATURE	CROHN'S DISEASE	ULCERATIVE COLITIS
Location	Mouth to anus; terminal ileum + proximal colon most common	Colon only; starts in rectum
Pattern	Skip lesions	Continuous lesion
Depth	Transmural	Mucosal/submucosal
Rectal involvement	Spared ~50%	Present ~95%
Bleeding	Less common, mild	Hallmark — bloody diarrhea
Diarrhea	Non-bloody, nocturnal	Bloody + urgency + tenesmus
Abdominal pain	RLQ pain (mimics appendicitis)	Left-sided cramping, post-prandial
Perianal disease	Common — fissures, fistulae, skin tags (~25-30%)	Rare
Fistulae / Abscesses	Yes — entero-enteric, entero-vesical	No
Strictures	Common (fibrosis)	Rare — if present, presume malignancy
Granulomas (biopsy)	Yes ~30% (key feature)	No
Crypt abscesses	Less prominent	Hallmark histology
Cobblestone mucosa	Yes (endoscopy)	No
Pseudopolyps	Occasional	Common (chronic disease)
Lead pipe colon (X-ray)	No	Yes (loss of haustra)
Peak age onset	15-30 yrs; 2nd peak 7th decade	20-40 yrs; smaller 2nd peak
Sex ratio	F > M (1.2:1)	M = F (1:1)
EIMs	More frequent (~35%)	Less frequent (~27%)
PSC association	Less common	More common (3-5%)
CRC risk	4-20× general population	Rises after 7-8 yrs; up to 34% at 30 yrs
Surgery	NOT curative	CURATIVE (colectomy)

3. VISUAL COMPARISON

UC Phenotypes (Montreal Classification):

Proctitis (E1, 30-60%) → Left-sided (E2, 16-45%) → Pancolitis (E3, 15-35%)

UC Colonoscopy — Severe UC (erythema, friability, loss of vascular pattern):

Crohn's Histology — Epithelioid granulomas (key distinguishing feature from UC):

Toxic Megacolon (UC complication) — Plain AXR, transverse colon >6 cm:

CD MR Enterography — Comb sign + mural thickening, terminal ileum:

4. CLASSIFICATION SYSTEMS

4A. Montreal Classification — Ulcerative Colitis

EXTENT:

Code	Name	Anatomy
E1	Ulcerative Proctitis	Rectum only
E2	Left-sided UC	Distal to splenic flexure
E3	Extensive UC / Pancolitis	Proximal to splenic flexure

SEVERITY:

Code	Severity	Definition
S0	Remission	No symptoms
S1	Mild	≤4 stools/day, no systemic illness, normal ESR
S2	Moderate	≥4 stools/day, minimal systemic toxicity
S3	Severe	≥6 bloody stools/day + pulse ≥90 + temp ≥37.5°C + Hb <10.5 g/dL + ESR ≥30 mm/h

4B. Montreal Classification — Crohn's Disease (A-L-B)

AGE (A):

Code	Definition
A1	≤16 years
A2	17-40 years
A3	>40 years

LOCATION (L):

Code	Definition
L1	Terminal ileum (±limited cecal disease)
L2	Colonic only
L3	Ileocolonic
L4	Upper GI modifier (add to L1-L3)

BEHAVIOR (B): (typically progresses B1 → B2 → B3 over time)

Code	Definition
B1	Inflammatory (non-stricturing, non-penetrating)
B2	Stricturing / Fibrostenotic
B3	Penetrating / Fistulizing
+p	Perianal disease modifier (add to any B, e.g. B3p)

5. DIAGNOSIS

Investigation	Crohn's Disease	Ulcerative Colitis
Labs	Elevated CRP/ESR; anemia (chronic disease, B12 deficiency if ileal); hypoalbuminemia	Elevated CRP/ESR; anemia (blood loss); leukocytosis
Fecal Calprotectin	Elevated; sensitivity ~88%, specificity ~67%	Elevated; sensitivity ~88%, specificity ~79%
Stool cultures	MANDATORY FIRST — exclude C. diff, Salmonella, Campylobacter, Giardia before immunosuppression	Same — mandatory before starting therapy
Serology	ASCA+ (40-70%) / pANCA− → CD	pANCA+ (55%) / ASCA− → UC
Colonoscopy + biopsy	Skip lesions, cobblestone, linear ulcers, rectal sparing; granulomas	Continuous inflammation from rectum; friability; crypt abscesses, NO granulomas
CT/MR Enterography	Gold standard for small bowel; mural thickening, comb sign, strictures, fistulae, abscesses	Not first-line; use for toxic megacolon/perforation
Capsule endoscopy	If CTE negative but CD suspected. CONTRAINDICATED if stricture present	Not used
Plain AXR	Dilated loops (obstruction); free air (perforation)	Toxic megacolon: transverse colon >6 cm + loss of haustra

Key: Diagnosis = clinical + endoscopic + histologic correlation. Always exclude infection first. Mucosal healing (not just symptoms) is the therapeutic target.

6. TREATMENT

Drug Classes

Drug Class	Agents	Crohn's	Ulcerative Colitis
5-ASA	Mesalamine, sulfasalazine	NOT recommended routinely in CD	FIRST-LINE mild-moderate UC; induction + maintenance
Corticosteroids	Prednisone 40-60 mg/d; IV methylprednisolone; Budesonide	Flares only (NOT maintenance); Budesonide for mild-moderate ileocecal CD	Flares only; IV steroids for severe UC
Immunomodulators	AZA 2-3 mg/kg; 6-MP 1-1.5 mg/kg; MTX 25 mg/wk IM	Maintenance; steroid-sparing; combine with biologics	Maintenance; steroid-sparing (AZA/6-MP)
Anti-TNF	Infliximab (IV q8w); Adalimumab (SC q2w); Certolizumab (CD); Golimumab (UC)	Moderate-severe CD; fistulizing disease	Moderate-severe UC; IV infliximab = rescue for acute severe UC
Anti-integrin	Vedolizumab (IV/SC)	Moderate-severe CD	Moderate-severe UC; preferred in elderly
Anti-IL-12/23	Ustekinumab (IV induction → SC q8-12w)	Moderate-severe CD; anti-TNF failure	Moderate-severe UC
JAK inhibitors	Tofacitinib; Upadacitinib; Ozanimod	Upadacitinib for CD	Tofacitinib/upadacitinib for UC
Antibiotics	Metronidazole, Ciprofloxacin	Perianal disease, abscesses (NOT primary therapy)	Pouchitis post-IPAA (NOT primary therapy)

Step-by-Step Algorithms

CROHN'S DISEASE:

Mild-moderate ileocecal: Budesonide 9 mg/day × 8-12 wk → add AZA/6-MP if steroid-dependent
Moderate-severe: Anti-TNF (infliximab/adalimumab) ± AZA → ustekinumab/vedolizumab if anti-TNF fails → upadacitinib for refractory
Fistulizing/perianal: EUA + abscess drainage → antibiotics bridge → IV infliximab → seton for complex fistulae
Surgery: Stricturoplasty or bowel-sparing resection; NOT curative — postoperative prophylaxis essential

ULCERATIVE COLITIS:

Mild-moderate proctitis/left-sided: Topical 5-ASA (suppository/enema) + oral mesalamine
Mild-moderate extensive: Oral mesalamine 2-4.8 g/day → prednisone if 5-ASA fails → AZA/6-MP maintenance
Moderate-severe: Anti-TNF (infliximab/golimumab) or vedolizumab or tofacitinib
Acute severe UC (hospital): IV methylprednisolone 60 mg/day → if no response in 3-5 days → rescue: IV infliximab OR IV cyclosporine → colectomy if rescue fails
Toxic megacolon: Emergency subtotal colectomy
Surgery: Proctocolectomy + IPAA (J-pouch) = CURATIVE

7. EXTRAINTESTINAL MANIFESTATIONS

Category	Manifestation	Association	Notes
Joints	Peripheral arthritis (Type 1 & 2)	Both (CD > UC)	Type 1 parallels bowel activity; Type 2 independent
Joints	Ankylosing spondylitis	Both; HLA-B27+	Course independent of bowel disease
Joints	Sacroiliitis	Both	Often silent; MRI pelvis
Skin	Erythema nodosum	Both (CD > UC)	Tender shin nodules; parallels bowel activity
Skin	Pyoderma gangrenosum	Both (UC > CD)	Ulcerating; independent; avoid debridement
Eyes	Episcleritis / Scleritis	Both	Parallels bowel activity
Eyes	Uveitis / Iritis	Both (CD > UC)	Independent; urgent ophthalmology
Liver	Primary Sclerosing Cholangitis	UC >> CD (3-5%)	Elevated ALP; annual colonoscopy; CRC + cholangiocarcinoma risk
Liver	Cholelithiasis	CD (ileal)	Bile salt malabsorption → cholesterol stones
Metabolic	Osteoporosis	Both (steroids)	DEXA scan; Ca²⁺ + Vit D
Metabolic	B12/Iron/Folate anemia	CD ileal > UC	B12 deficiency specific to ileal CD/resection
Renal	Oxalate nephrolithiasis	CD (ileal)	Hyperoxaluria; fatty acid-oxalate binding
Vascular	DVT / PE	Both (flares)	IBD is prothrombotic; VTE prophylaxis in hospital

8. MONITORING & CANCER SURVEILLANCE

Routine monitoring:

CBC, CRP, ESR, LFTs, albumin every 3-6 months (active) / 6-12 months (remission)
Fecal calprotectin — non-invasive mucosal activity marker
TPMT/NUDT15 genotyping before AZA/6-MP
TB screening (Quantiferon-IGRA) before biologics
Vaccinations before immunosuppression: Flu (annual), Pneumococcal, Hep B, HPV, Varicella
DEXA if steroids >3 months; Vitamin B12, iron, 25-OH Vitamin D annually

Cancer surveillance colonoscopy:

UC extensive disease: Start at 8-10 years from symptom onset
Every 1-2 years with 4-quadrant biopsies every 10 cm
Crohn's colitis: same protocol as UC pancolitis
PSC + UC: Annual colonoscopy from PSC diagnosis
Stricture in UC = presume malignant until proven otherwise

Sources: Sleisenger & Fordtran's GI Disease • Harrison's 22e (2025) • Goldman-Cecil Medicine • Rosen's Emergency Medicine • Sabiston Textbook of Surgery

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