Aggressive fibromatosis in the submandibular region of a child.

Aggressive fibromatosis is proliferation of well-differentiated fibroblasts. Submandibular region is rare location for fibromatosis. We report a case of a rapidly growing mass in submandibular region of 5-year-old girl, excised surgically and ascertained to be aggressive fibromatosis on histological examination. Recovery was uneventful, and she was disease-free in 6-month follow-up.