Noninvoluting congenital hemangioma.

An 8-year-old boy presented with a lifelong history of a vascular mass overlying his right mandible with central coarse telangiectasias and peripheral pallor. Histopathologic examination showed a proliferation of blood vessels in the dermis. Ultrasound examination identified a mix of high- and low-flow vessels within the lesion. These findings were consistent with a noninvoluting congenital hemangioma, a rare vascular tumor that is fully formed at birth that subsequently grows proportionately with the patient and does not regress.