SDH-deficient renal cell carcinoma - clinical, pathologic and genetic correlates: a case report.

Succinate dehydrogenase (SDH)- deficient renal cell carcinoma (RCC) is a newly identified rare subtype of RCC, having only gained acceptance from the World Health Organization in 2016. To the best of our knowledge, there are only 55 reported cases worldwide. Here, we report a new case of SDH-deficient RCC.

A 49-year-old male patient was incidentally found to have a large right renal mass. He had no personal or family history of paragangliomas (PGL), pheochromocytomas (PC), or gastrointestinal stromal tumors (GIST). The neoplasm was unilateral and unifocal. He underwent an open partial nephrectomy. Detailed pathological analysis was conducted to confirm the diagnosis. Genetic testing revealed a pathogenic mutation in the SDHB gene. He has been followed for 24 months now and has remained well without any evidence of local or distant recurrence. In this report we describe our experience with this diagnosis and review the relevant clinical, pathological, and genetic features.

Without the identification of SDHB deficiency, this patient's personal and familial predisposition to PC, PGL, GIST and metachronous RCCs may have gone undetected despite his RCC diagnosis. When faced with an eosinophilic RCC, pathologists should routinely search for vacuoles or flocculent cytoplasmic inclusions. When these are present, or in cases of difficult eosinophilic renal tumors, staining for SDHB is recommended. For tumours without adverse pathologic features (i.e. high nuclear grade, coagulative necrosis, or sarcomatoid differentiation) excision alone may be a reasonable option, with the addition of regular surveillance for PC and PGLs in those found to harbor germline SDH mutations.

BMC urology. 2018 Nov 27*** epublish ***

Ravi Kumar, Michael Bonert, Asghar Naqvi, Kevin Zbuk, Anil Kapoor

Division of Urology, Department of Surgery, The Ottawa Hospital, University of Ottawa, Ottawa, Canada. ., Division of Pathology, Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada., Division of Medical Oncology, Department of Oncology, Juravinski Cancer Centre, McMaster University, Hamilton, ON, Canada., Division of Urology, Department of Surgery, Juravinski Cancer Centre, McMaster University, Hamilton, ON, Canada.