2020-13 / MARCH 31 (CONTRIBUTOR: DANIEL H. RUSSELL)
A 29-year-old man presented with symptoms of lithiasis and was found to have a heavily calcified 1.9 cm renal mass, interpreted radiographically as a benign process. IHC was performed for CK7 (diffuse positive), and CA-IX (diffuse positive, picture shown) and CD10 (negative).
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1. What is the correct diagnosis?
a. Multilocular cystic renal neoplasm of low malignant potential
b. Clear cell papillary renal cell carcinoma
c. Clear cell renal cell carcinoma with regression
d. Renal cell carcinoma with leiomyomatous stroma
e. Unclassified renal cell carcinoma