title: Recurrent renal leiomyosarcoma mimicking a colonic submucosal tumor: a case report.
abstract: A primary leiomyosarcoma of the kidney is a rare, but highly aggressive, neoplasm, accounting for only 0.1% of all invasive renal tumors. Local or systemic recurrence is common, but a leiomyosarcoma is difficult to diagnose preoperatively. We recently encountered an interesting case of an unusual recurrence of a renal leiomyosarcoma. A 57-year-old woman visited our hospital complaining of lower abdominal pain. Four years previously, she had undergone a left nephrectomy. She had a primary leiomyosarcoma of the kidney that had been misdiagnosed as a renal cell carcinoma. Colonoscopy revealed the presence of a lesion similar to a submucosal tumor in the descending colon. Postoperative pathologic examination confirmed that the mass was a recurrent leiomyosarcoma. We report this unusual case and present a review of the literature.
authors: Department of Internal Medicine, Chungnam National University Hospital, Daejeon, Korea.
authors: Yun Jeung
authors: YJ
authors: Kim
authors: Hee Seok
authors: HS
authors: Moon
authors: Eaum Seok
authors: ES
authors: Lee
authors: Jae Kyu
authors: JK
authors: Sung
authors: Hyun Yong
authors: HY
authors: Jeong
authors: Ji Yeon
authors: JY
authors: Kim
authors: Dae Young
authors: DY
authors: Kang