title: Solitary fibrous tumor of the kidney with massive retroperitoneal recurrence. A case presentation.
abstract: Solitary fibrous tumor is an unusual spindle cell neoplasm that usually           occurs in the pleura but has also been described in other sites. Renal presentation           is rare and only 38 cases of SFT of the kidney have been described until now.           Up to 90% of the tumors have benign characteristics. Local retroperitoneal           recurrence is extremely rare. We report a case of a large malignant solitary fibrous           tumor recurrence after the surgical excision of the primary tumor. Histological           examination of the specimen confirmed the diagnosis by revealing highly positive           reaction of the neoplasmatic cells for vimentin, CD34, bcl-2 and moderately           positive for actin. The rate of Ki67 lied between 2-7%. No adjuvant therapy was           given to the patient and he is disease-free with no imaging findings of recurrence           or metastasis 9 months after the re-operation.
authors.affiliation: Department of Urology, University Hospital of Patras, Patras, Greece. sfoungaristosst@gmail.com
authors.forename: S
authors.initials: S
authors.lastname: Sfoungaristos
authors.forename: M
authors.initials: M
authors.lastname: Papatheodorou
authors.forename: A
authors.initials: A
authors.lastname: Kavouras
authors.forename: P
authors.initials: P
authors.lastname: Perimenis
mesh_terms: D000368:Aged; D006801:Humans; D007680:Kidney Neoplasms / Q000473:pathology* / Q000601:surgery; D008297:Male; D012186:Retroperitoneal Neoplasms / Q000556:secondary*; D054364:Solitary Fibrous Tumors / Q000473:pathology / Q000556:secondary* / Q000601:surgery