A case of smooth muscle tumor of uncertain malignant potential with peritoneal dissemination recurrence

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  • 再発をきたした悪性度不明な子宮平滑筋腫瘍の1例
  • フクマク ハシュ オ キタシタ アクセイド フメイナ シキュウ ヘイカツキン シュヨウ ノ 1レイ

Abstract

Smooth muscle tumor with uncertain malignant potential can recur and become metastatic; however, reports regarding its recurrence are scarce. Here we present a case of a 68-year-old woman with a smooth muscle tumor with uncertain malignant potential with peritoneal dissemination recurrence that occurred approximately 13 years after initial hysterectomy. The patient had a history of bilateral salpingo-oophorectomy and total hysterectomy for low-grade uterine sarcoma at the age of 55 years. The patient underwent open surgery for recurrence in the pelvis at the age of 60 years. At follow-up, abdominal computed tomography revealed a uniform tumor measuring approximately 55 mm × 55 mm × 40 mm near the spleen with a clear boundary. During laparotomy, peritoneal dissemination recurrence, which was not detected preoperatively, was revealed. All recurrent tumors were macroscopically removed. The patient was pathologically diagnosed with smooth muscle tumor of uncertain malignant potential. No recurrence was found at postoperative 1 year. Smooth muscle tumors with uncertain malignant potential may recur with peritoneal metastasis long after surgery. Based on our experience, we concluded that local resection is possible in such cases. Therefore, surgery is recommended for recurrent smooth muscle tumors with an uncertain malignant potential.

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