[Solitary pararenal fibrous tumor].

Objectives: To report a rare clinical case of solitary pararenal fibrous tumor, analyzing its pathological characteristics and prognosis by a bibliographic review.

Methods/results: We present the case of a 36-year-old male consulting for right flank colic pain, which was diagnosed of a solid mass in the lower pole of the right kidney and underwent right radical nephrectomy. Pathological study of the surgical specimen showed the presence of a solitary pararenal fibrous tumor.

Conclusions: Solitary fibrous tumor is a rare neoplasia, being its pararenal localization even rarer. It is a tumor with benign behavior in up to 90% of the cases. The immunohistochemical study is the key to diagnosis.