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Pathology · Systemic pathology: bronchial carcinoid
Sample itemA 35-year-old non-smoking woman has recurrent haemoptysis and a polypoid endobronchial mass. Histology shows uniform cells in nests and ribbons with finely stippled chromatin, and scarce mitoses without necrosis. What is the diagnosis?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
B. Typical carcinoid tumour
Typical carcinoid is a low-grade neuroendocrine tumour of bronchial wall, often central, with organoid nests, salt-and-pepper chromatin and few mitoses. Small cell carcinoma has the same chromatin pattern but many mitoses and necrosis.
Option by option
A. Small cell carcinoma
Small cell carcinoma is a high-grade tumour of smokers with abundant mitoses and necrosis.
B. Typical carcinoid tumour (correct)
Correct. Organoid nests, stippled chromatin and very low mitotic activity indicate a typical carcinoid.
C. Adenoid cystic carcinoma
Adenoid cystic carcinoma shows cribriform spaces with hyaline material, not neuroendocrine nests.
D. Pulmonary hamartoma
A hamartoma consists of cartilage, fat and epithelium, not uniform neuroendocrine cells.
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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