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The fibromatoses are histologicaly benign fibrous neoplasms arising from the musculoaponeurotic structures throughout the body. They are characterized as infiltrative, usually well-differentiated firm overgrowth of fibrous tissue and are localy agressive. rectus abdominis muscle. The majority of extra-abdominal fibromatoses originate from the shoulder and pelvic girdle musculature. Other sites include the extremities, the bowel mesentery, and the head and neck. Surgery is the first-line treatment for extra-abdominal and abdominal wall fibromatoses. The aim of excisional surgery as primary treatment for aggressive fibromatosis is e local recurence rate is up to 90%. Recently, we have experienced a case of adult-onset fibromatosis arising in submental area. The lesion was excised and diagnosis was confirmed by histologic examination. (Korean J Otolaryngol 2003 ;46 :345-8)