A Case of Subcutaneous Low-Grade Fibromyxoid Sarcoma on the Suprapubic Area

Abstract

Low-grade fibromyxoid sarcoma (LGFMS) is characterized by an uncommon and slow-growing malignant tumor, and mostly occurs in deep soft tissues. We report on a 3-year-old boy with subcutaneous LGFMS. A mass was located in the suprapubic area at medical checkup. An ultrasound examination showed a 1-cm mass suspected to be a dermoid cyst; he underwent tumor excision. The tumor did not adhere to the surrounding tissues. The pathological diagnosis was LGFMS. Because the resected margin was close to the tumor, we performed additional surgery to remove a margin 1 cm from the border of the previous resection, 2 months after the initial surgery. Residual tumor cells were pathologically observed in the resected subcutaneous tissue. The patient is currently followed up, and has presented no signs of recurrence to date. Although LGFMS is a rare tumor, it should be considered as a differential diagnosis for soft tissue tumors. Long-term observations are required.