What type of birthmark is associated with Sturge-Weber syndrome?

Sturge-Weber syndrome is specifically associated with a port wine stain, which is a type of vascular malformation. This syndrome is a neurocutaneous condition characterized by a facial birthmark, typically located on the forehead and eyelid, often resembling a port wine stain. The presence of this birthmark correlates with an abnormality in the blood vessels beneath the skin, which can lead to neurological complications such as seizures, developmental delays, and other brain-related issues.

In the context of Sturge-Weber syndrome, the port wine stain is more than just a cosmetic mark; it is an indicative sign of the underlying condition and its potential neurological implications. The other types of birthmarks listed, such as the strawberry mark and melanocytic nevus, are not associated with Sturge-Weber syndrome and do not carry the same implications regarding the syndrome's characteristic neurological features. Thus, the correct identification of a port wine stain as the type of birthmark associated with Sturge-Weber syndrome is essential for understanding the condition as a whole.