77 y.o. M, radical nephrectomy. CT showed a large cystic lesion “arising from the right inferior kidney.” MRI findings favored a primary cystic renal cell neoplasm. Higher power photos in the chat. What's your diagnosis? #PathTwitter @MGBpathology @MGHPathology @PathDocBoston
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@MGBpathology @MGHPathology @PathDocBoston Perirenal dedifferentiated liposarcoma #GUpath #BSTpath #Molpath