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General Surgery · Urology: histology of seminoma
Sample itemA 33-year-old man has a painless testicular mass. After orchidectomy, histology shows sheets of uniform polygonal cells with clear cytoplasm separated by fibrous septa infiltrated by lymphocytes. Serum AFP is normal. What is the diagnosis?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
D. Seminoma
Seminoma shows uniform cells with clear cytoplasm in sheets, fibrous septa with lymphocytes, and a normal AFP. It is very radiosensitive and has an excellent cure rate. A raised AFP indicates a non-seminomatous component such as yolk sac tumour.
Option by option
A. Embryonal carcinoma
Embryonal carcinoma shows pleomorphic cells in glands and papillae with necrosis.
B. Yolk sac tumour
Yolk sac tumour shows Schiller-Duval bodies and is associated with a raised AFP.
C. Mature teratoma
Mature teratoma contains differentiated tissues from more than one germ layer.
D. Seminoma (correct)
Correct. Uniform clear cells in sheets with lymphocytic septa and normal AFP are typical of seminoma.
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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