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Synovial sarcoma of the kidney: a clinicopathologic, immunohistochemical, and molecular genetic study of 16 cases.
American Journal of Surgical Pathology 2014 January
We report the clinicopathologic and immunohistochemical features of 16 cases of genetically confirmed primary synovial sarcoma of the kidney. The cases occurred in 9 men and 7 women ranging in age from 17 to 78 years (mean, 46 y). The tumors were grossly large, solid, and variably cystic (2.2 to 19.0 cm; mean 8.6 cm). Microscopically, all tumors were of the monophasic type and diffusely immunoreactive for TLE1 and BCL-2. Focal pankeratin positivity was found in just under half. Ten cases carried an SS18-SSX2 fusion transcript, and 5 cases showed an SS18-SSX1 transcript by reverse transcription polymerase chain reaction. The remaining case demonstrated SS18 rearrangement by fluorescence in situ hybridization. Clinical follow-up information was available for 12 patients (range, 1 to 77 mo; mean, 32.5 mo). Fourteen patients underwent radical nephrectomy, and 3 patients had lung metastases at presentation. Six patients died of disease within 1 to 58 months (mean, 31 mo) of their diagnosis. Five patients were alive without evidence of disease 12 to 77 months (mean, 39 mos) after surgery. A single patient was alive with metastases to the spine 11 months after surgery. We conclude that renal synovial sarcoma is an aggressive tumor, with adverse patient outcome in >50% of cases. Synovial sarcoma must be distinguished from morphologically similar lesions of the kidney.
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