TUMEUR FIBREUSE SOLITAIRE RETROPERITONEALE : A PROPOS D’UNE OBSERVATION AU CENTRE HOSPITALIER UNIVERSITAIRE HUBERT KOUTOUKOU MAGA DE COTONOU (BENIN)

Abstract

Solitary fibrous tumors (SFT) usually develop in the pleura. Several extrapleural locations of these tumors have been recently reported. Here we report the case of a large retroperitoneal SFT. This was a 62-year-old patient admitted with a painful left flank mass that had progressed for 6 months with no other associated signs. She presented a good general condition and an arching of the left flank which corresponded to a firm, regular and sensitive mass, not adherent to the superficial plane, little mobile in relation to the deep plane and measuring 10 cm. This mass was solid and echogenic with significant vascularization on ultrasound, and was intensely enhanced with perilesional neovascularization on CT. Under general anesthesia, surgical exploration, by a midline laparotomy associated secondarily with a left transverse one, revealed a retroperitoneal mass of the left flank and the iliac fossa of about 10 cm long axis without extension to neighboring organs rendering its resection complete. The operative consequences were simple. Pathological examination of the resection piece concluded that a retroperitoneal TFS was completely excised. On immunohistochemistry, tumor cells strongly expressed CD34. They were also positive to CD99 and bcl2. With a follow-up of 2 years, there is no sign of recurrence but long-term follow-up is still necessary. Retroperitoneal SFT is rare. Diagnosis was confirmed by immunohistochemistry after complete tumor removal. Long-term follow-up is still necessary. Key words: Solitary fibrous tumor, retroperitoneum, Surgery, immunohistochemistry, Prognosis