title: Solitary fibrous tumor of the kidney: a case report and review of the literature.
abstract: A solitary fibrous tumor (SFT) is an unusual spindle cell neoplasm that usually occurs in the pleura but has recently been described in diverse extrapleural sites. Urogenital localization is rare, and only 19 cases of SFT of the kidney have been described. We report a case of a large SFT clinically thought to be renal cell carcinoma arising in the kidney of a 70-year-old man. The tumor was well circumscribed and composed of a mixture of spindle cells and dense collagenous bands, with areas of necrosis or cystic changes noted macroscopically and microscopically. Immunohistochemical studies revealed reactivity for CD34, CD99, and Bcl-2 protein, with no staining for keratin, S-100 protein, or muscle markers, confirming the diagnosis of SFT. This tumor is benign in up to 90% of cases. The immunohistochemical study is the key to diagnosis.
authors: Kaoutar
authors: K
authors: Znati
authors: Laila
authors: L
authors: Chbani
authors: Hinde
authors: H
authors: El Fatemi
authors: Taoufik
authors: T
authors: Harmouch
authors: Imane
authors: I
authors: Kamaoui
authors: Fadl
authors: F
authors: Tazi
authors: Sanae
authors: S
authors: Bennis
authors: Afaf
authors: A
authors: Amarti