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Pathology · Inflammation and repair
Sample itemA diabetic woman has recurrent E. coli urinary infection. Cystoscopy shows soft yellow-brown bladder plaques. Biopsy shows sheets of foamy macrophages with laminated, calcified basophilic inclusions. What is the diagnosis?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
C. Malakoplakia
Malakoplakia is a chronic inflammation caused by defective macrophage bacterial killing. Michaelis-Gutmann bodies are calcified, partly digested bacterial remnants inside the macrophages.
Option by option
A. Urothelial carcinoma
Urothelial carcinoma shows atypical urothelial cells, not macrophages with inclusions.
B. Schistosomal cystitis
Schistosomal cystitis shows eggs with eosinophilic and granulomatous inflammation and squamous metaplasia.
C. Malakoplakia (correct)
Correct. Foamy macrophages with Michaelis-Gutmann bodies after E. coli infection are diagnostic.
D. Tuberculous cystitis
Tuberculous cystitis shows caseating granulomas with acid-fast bacilli.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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