Case 141

A 63-year-old male with a large kidney mass.

IHC

What's the diagnosis if keratin is negative?

A: Synovial sarcoma

B: SMACA4 deficient medullary carcinoma

C: Collecting duct carcinoma

D: Solitary fibrous tumor

E: Diffuse large B cell lymphoma

Answer

The tumor is diffusely positive for STAT6, this is a SFT.

Case credit: UCSD pathology

Author: Wangpan Jackson Shi, MD

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