Management of congenital vascular lesions of the head and neck.

Congenital vascular lesions are often misdiagnosed and, for the most part, left untreated. The absence of a uniformly accepted classification of these lesions and confusion over their natural history are partly responsible. A new classification of these lesions recognizes two distinct groups of lesions, hemangiomas and vascular malformations. Hemangiomas are usually not present at birth, proliferate during the first year of life, and then involute. In contrast, vascular malformations are always present at birth, never proliferate, and never involute. Knowledge of this classification system will facilitate the diagnosis of these lesions and lead to appropriate, individualized treatment.