Expanding the clinico-pathological spectrum of SDH Deficient RCC

Most succinate dehydrogenase (SDH)-deficient RCCs demonstrate classic morphology characterized by bland eosinophilic cells with intracytoplasmic inclusions. Increasingly, “variant” morphologic features are recognized. Drs. Anthony Gill and Talia Fuchs discuss with the host their findings in a recent publication in Modern pathology where features such as high-grade nuclear features, necrosis, papillary, solid, and tubular architecture are present. These features appear to be associated with more aggressive behavior emphasizing the need for a low threshold for performing SDHB immunohistochemistry in any difficult to classify renal tumor; particularly if occurring at a younger age.

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