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Clinical History:
78 year old male with history of bladder cancer
developed a renal mass.
Histology: Figure A
shows small round to fusiform cells with scant
cytoplasm, abundant mitosis and finely granular nuclear
chromatin with absent nucleoli.
Special immunoperoxidase staining for CD56 in Figure B
shows >90% of the tumor cells positive for CD56 antigen,
all these findings consistent with small cell carcinoma
invading the renal parenchyma.
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