Bilateral renal metastasis of an inguinal malignant solitary fibrous tumor, 9 years after primary surgical treatment.

OBJECTIVE To report the first case of a bilateral renal solitary fibrous tumor (SFT) as a metastasis of an inguinal malignant SFT. CLINICAL PRESENTATION AND INTERVENTION A 60-year-old male patient with a history of a right inguinal 7 × 8 cm soft tissue mass excision 9 years ago was referred to our clinic with abdominal pain. Both physical examination and chest X-ray were normal. Computed tomography revealed bilateral renal tumor. He was successfully treated with left partial and right radical nephrectomy. Histopathological examination showed a metastasis of the previous inguinal SFT. CONCLUSION This case showed that although malignant SFT is extremely rare in the urogenital tract, this tumor should be included in the differential diagnosis when identified in the kidneys.