Caseating vs Non-Caseating Granulomas Differential
Granuloma morphology separates caseating from non-caseating patterns — a distinction that appears on USMLE Step 1 and shelf exams. Mastering which organisms and conditions drive each type helps pathology students interpret biopsy findings, clinical vignettes, and histological images accurately.
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5 CardsConditions causing non-caseating granulomas
Giant cells in granulomas
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What is the difference between caseating and non-caseating granulomas?
Caseating granulomas have central cheese-like necrosis caused by organisms like TB and endemic fungi. Non-caseating granulomas lack necrosis and appear in sarcoidosis, Crohn disease, and berylliosis.
- Necrosis present = caseating
- No necrosis = think sarcoidosis first
Why does tuberculosis cause caseating granulomas?
M. tuberculosis triggers a type IV hypersensitivity (delayed-type) reaction. The immune response causes central necrosis as macrophages and T cells wall off the infection, producing the characteristic caseous appearance.
How do I remember which diseases cause which granuloma type?
Use the mnemonic: Necrosis = infectious for caseating (TB, endemic fungi). No necrosis = non-infectious for sarcoidosis, Crohn disease, berylliosis, and foreign bodies. This covers 90% of USMLE-style questions.