Regarding the histopathological features of inflammatory bowel disease, all of the following are characteristic of Crohn's disease EXCEPT:

Question

Accepted Answer

A. Continuous involvement of the mucosa and submucosa with skip lesions. ## Distinguishing Histopathology of IBD

### Crohn's Disease vs Ulcerative Colitis

| Feature | Crohn's Disease | Ulcerative Colitis |
|---------|-----------------|-------------------|
| **Depth of inflammation** | Transmural (all layers) | Mucosal and submucosal only |
| **Distribution** | Skip lesions (patchy, discontinuous) | Continuous, confluent |
| **Granulomas** | Non-caseating (30–50%) | Absent |
| **Crypt distortion** | Present | Present |
| **Fissuring ulcers** | Characteristic | Absent |
| **Cobblestone appearance** | Yes (due to transmural involvement) | No |

### Analysis of Options

**Key Point:** Crypt distortion and branching occur in BOTH Crohn's disease and ulcerative colitis — this is a non-specific feature of chronic inflammation.

**High-Yield:** The hallmark of Crohn's disease is **transmural inflammation** with **skip lesions** (patchy, discontinuous areas of disease interspersed with normal mucosa).

**Option 1 (Crypt distortion):** ✓ Correct — seen in Crohn's disease.

**Option 2 (Non-caseating granulomas):** ✓ Correct — present in 30–50% of Crohn's cases; their absence does not exclude Crohn's disease.

**Option 3 (Continuous involvement with skip lesions):** ✗ **WRONG** — This is a **contradiction**. Crohn's disease is characterized by **discontinuous (skip) lesions**, NOT continuous involvement. Ulcerative colitis shows **continuous, confluent mucosal involvement**. This option conflates the two diseases.

**Option 4 (Transmural inflammation):** ✓ Correct — the defining feature of Crohn's disease; extends through muscularis propria and may reach serosa, causing fistulas and strictures.

**Clinical Pearl:** A patient with Crohn's disease may have normal-appearing bowel between areas of severe inflammation — this skip pattern is pathognomonic and helps distinguish it from the continuous inflammation of ulcerative colitis.

**Mnemonic:** **SKIP = Segmental (Crohn's); CONTINUOUS = Colitis (UC)**

Answer

B. Crypt distortion and branching

Answer

C. Non-caseating granulomas in 30–50% of cases

Answer

D. Transmural inflammation extending into the muscularis propria and beyond

Regarding the histopathological features of inflammatory bowel disease, all of the following are characteristic of Crohn's disease EXCEPT:

Explanation

Distinguishing Histopathology of IBD

Crohn's Disease vs Ulcerative Colitis

Analysis of Options

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Feature	Crohn's Disease	Ulcerative Colitis
Depth of inflammation	Transmural (all layers)	Mucosal and submucosal only
Distribution	Skip lesions (patchy, discontinuous)	Continuous, confluent
Granulomas	Non-caseating (30–50%)	Absent
Crypt distortion	Present	Present
Fissuring ulcers	Characteristic	Absent
Cobblestone appearance	Yes (due to transmural involvement)	No