A 25-year-old man presents with a painless right testicular mass. Serum AFP is 2,800 ng/mL, beta-hCG is 45 IU/L, and LDH is 1.8× ULN. CT reveals retroperitoneal lymphadenopathy up to 3 cm. After right radical orchiectomy, histology shows pure seminoma. How do you interpret the elevated AFP in this context?
- A AFP elevation confirms seminoma with hepatic metastasis
- B AFP can be elevated in pure seminoma due to yolk sac differentiation
- C AFP elevation indicates the tumor contains non-seminomatous elements (NSGCT) and should be reclassified as NSGCT ✓
- D The AFP elevation is likely due to concurrent liver disease; seminoma diagnosis stands
Explanation
Pure seminoma does NOT produce AFP. AFP is exclusively secreted by yolk sac tumor (endodermal sinus tumor) elements. An elevated AFP in the context of an apparently histologically pure seminoma means the sampling was inadequate and non-seminomatous elements are present — the tumor must be reclassified as non-seminomatous germ cell tumor (NSGCT) and managed with NSGCT protocols (bleomycin, etoposide, cisplatin — BEP). This is a critical clinical decision-making point. Retroperitoneal lymphadenopathy with AFP >1,000 ng/mL places this in IGCCCG intermediate or poor prognosis category.
Reference: Bailey & Love's Short Practice of Surgery, 27th ed.
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Written and medically reviewed by the StethoPrep medical team.