A renal solitary fibrous tumor (SFT) is an unusual and especially rare entity. Preoperative diagnosis is usually difficult, but it remains of favorable prognosis. In this study, the authors report a case of a 33-year-old Moroccan man with a history of left pyelolithotomy who presented with a 19 cm left renal mass associated with two kidney stones in the lower calyx. He underwent an open radical nephrectomy, and pathology revealed a renal SFT. To the best of our knowledge, our patient is the first case of renal SFT with a history of urolithiasis and presenting with concomitant ipsilateral calculi. Radical nephrectomy is still the cornerstone gold standard therapy for patients with large renal tumors, especially for rare tumors with no proper protocol.
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