Which of the following conditions is classically associated with non-caseating granulomatous inflammation?

Question

Accepted Answer

A. Sarcoidosis. ## Non-Caseating vs. Caseating Granulomas

**Key Point:** **Sarcoidosis** is the prototypical cause of non-caseating granulomatous inflammation. The absence of central caseous necrosis is a hallmark feature that helps distinguish it from tuberculosis.

### Classification of Granulomatous Diseases

| Disease | Necrosis Type | Key Features |
|---------|---------------|---------------|
| **Sarcoidosis** | Non-caseating | Idiopathic; multisystem; elevated ACE; hypercalcemia |
| **Tuberculosis** | Caseating | Acid-fast bacilli; Ghon focus; cavitary lesions |
| **Leprosy** | Caseating (variable) | Acid-fast bacilli; skin/nerve involvement |
| **Fungal infections** | Caseating | Fungal elements visible on special stains |
| **Berylliosis** | Non-caseating | Occupational exposure to beryllium |
| **Crohn's disease** | Non-caseating | GI tract; skip lesions; fissuring ulcers |

**High-Yield:** The **presence of caseous necrosis** suggests an infectious etiology (TB, fungal, leprosy); **absence of caseous necrosis** suggests a non-infectious cause (sarcoidosis, Crohn's, berylliosis).

### Sarcoidosis — Clinical Clues

- Multisystem involvement (lungs, skin, eyes, heart, CNS)
- Elevated serum ACE (angiotensin-converting enzyme)
- Hypercalcemia and hypercalciuria
- Diagnosis of exclusion (must rule out TB, fungal, Crohn's)

**Clinical Pearl:** When you see "non-caseating granuloma" on a biopsy, think **sarcoidosis first**, but always exclude infection (especially TB) with appropriate cultures and stains before confirming idiopathic sarcoidosis.

Answer

B. Leprosy

Answer

C. Tuberculosis

Answer

D. Fungal infections (histoplasmosis)

Which of the following conditions is classically associated with non-caseating granulomatous inflammation?

Explanation

Non-Caseating vs. Caseating Granulomas

Classification of Granulomatous Diseases

Sarcoidosis — Clinical Clues

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Disease	Necrosis Type	Key Features
Sarcoidosis	Non-caseating	Idiopathic; multisystem; elevated ACE; hypercalcemia
Tuberculosis	Caseating	Acid-fast bacilli; Ghon focus; cavitary lesions
Leprosy	Caseating (variable)	Acid-fast bacilli; skin/nerve involvement
Fungal infections	Caseating	Fungal elements visible on special stains
Berylliosis	Non-caseating	Occupational exposure to beryllium
Crohn's disease	Non-caseating	GI tract; skip lesions; fissuring ulcers