Intramuscular hemangioma of the lower lip.

We report a case of intramuscular hemangioma in the lower orbicularis oris muscle. A 5-year-old boy presented a fairly firm mass in the lower lip. The mass was noticed a few weeks after birth and had been progressing slowly for years. On histology, proliferating vascular channels infiltrated diffusely the skeletal muscle, adipose, and connective tissue. The vascular channel was lined inside by endothelium and varying amounts of component smooth muscle.