Solitary Fibrous Tumor of Kidney.

Solitary fibrous tumor of kidney is an unusual condition. It is spindle cell tumor with mesenchymal in origin so most commonly reported cases are in pleura, and extra-pleural sites are very rare. It is mostly benign in nature but malignant variant are also reported. Treatment is en bloc resection as in other sites whether pleural or extra-pleural. Prognosis is excellent. This tumor is difficult to diagnose only on imaging features; so for diagnosis, histopathology is needed mostly with immunohistochemical markers like CD34, CD99, Bcl2 proteins. A middle-aged male presented initially with clinical and radiological features, suspected of renal cell carcinoma. Surgery was performed, which proved solitary fibrous tumor on histopathology; and patient on follow-up remained tumor-free till the last follow-up.