Aggressive angiomyxoma is an uncommon mesenchymal tumor that mostly involves the pelvic and perineal regions in young women.We herein report an extremely rare case of aggressive angiomyxoma in a 75-year-old man. The patient had undergone follow-up for an intraductal papillary mucinous neoplasm.In September 2015, CT detected a tumor measuring 33 mm in diameter around the pelvis, and the tumor showed gradual increase in size.MRI revealed a relatively sharply marginated tumor with low signal intensity on T1-weighted images and high signal intensity on T2-weighted images.For treatment and diagnosis, we laparoscopically resected the tumor. Histopathologically, the specimen showed spindle tumor cells within a myxoid background and vascular structures.The tumor was diagnosed as aggressive angiomyxoma, and surgical margins were negative for tumor cells. The patient is currently doing well without any signs of recurrence as of 18 months postoperatively.
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