Birthmark Hemangiomas of Infancy Introduction
General Comments about Hemangiomas of Infancy
Hemangiomas of infancy are the most common vascular growth. They are seen in approximately 1% of all newborns and 10% of all one-year-old infants.
Only 30% of hemangiomas of infancy are seen at birth, most are noted within the first several months of life. Deeper hemangiomas of infancy may be detected later.
Hemangiomas of infancy consist of collections of endothelial cells. These endothelial cells can proliferate for six to 12 months, remain stable for one to three years, and then regress at a rate of 10% per year.
Approximately half of the hemangiomas of infancy are completely involuted by five to six years of age and virtually all are done involuting by age 10.
There are hemangiomas that do not follow this typical growth pattern. One type of non-involuting hemangioma is referred to as non involuting congenital hemangioma or NICH. A rapidly involuting congenital hemangioma or RICH resolves more rapidly than a hemangioma of infancy.
Hemangiomas of infancy are more common in premature and female infants.
Most hemangiomas of infancy are single lesions, seen on the head and neck region.
Hemangiomas of infancy can occur as well defined focal lesions (focal hemangiomas) or involve large segments of skin (segmental hemangiomas).