Clues to recognition of fumarate hydratase-deficient renal cell carcinoma: Findings from cytologic and limited biopsy samples.

Features characteristic and suggestive of FH-deficient RCC may be identified in cytologic and small biopsy samples. Although the current samples were identified retrospectively in well characterized cases of FH-deficient RCC, the authors argue that, with appropriate clinical correlation, these features are sufficiently distinctive to trigger recognition and confirmatory workup.