A Case of retroperitoneal solitary fibrous tumor

Abstract

Solitary fibrous tumor (SFT) of the retroperitoneal space is rare. We report a case of retroperitoneal tumor, diagnosed as SFT. A 69-year-old woman presented with right lower abdominal swelling, and was referred to our hospital with suspicion of right renal tumor. Abdominal ultrasound and computerized tomography (CT) showed a mass (about 15 x 14 x 10 cm) in the right abdomen. The tumor was thought to be right renal rumor, and right radical nephrectomy was performed. In the excised specimen the tumor was not connected to gastrointestinal tract, peritoneum, or right kidney. The histological and immunohistochemical examination of the specimen revealed SFT. The tumor has malignant potential with partially increased mitotic activity and cellularity in the histological examination. The patient is healthy and without evidence of recurrence or metastasis 26 months from surgery.

後腹膜solitary fibrous tumor(SFT)は稀な疾患である。症例は69歳, 女性。右下腹部の腫瘤を主訴に近医を受診, 右腎腫瘍が疑われ当科紹介となった。腹部超音波およびCT検査にて右腹部に15×14×10cm程の充実性腫瘤を認めた。右腎腫瘍と考えられ, 右根治的腎摘除術を施行した。腎と一塊に腫瘍を摘出したが, 摘出標本にて腎との連続性はなく, 後腹膜腫瘍と判断された。病理組織検査にてsolitary fibrous tumorと診断された。術後26ヵ月経過し, 現在再発の徴候なく外来通院中である。(著者抄録)