Which condition is known as encephalotrigeminal angiomatosis and is characterized by a facial birthmark?

The condition recognized as encephalotrigeminal angiomatosis is Sturge-Weber Syndrome. This syndrome is characterized by the presence of a facial birthmark known as a port-wine stain, which is a capillary malformation typically located in the distribution of the trigeminal nerve. In addition to the facial birthmark, Sturge-Weber Syndrome may involve neurological complications such as seizures, developmental delays, and other neurovascular anomalies.

The link between the facial birthmark and neurological manifestations is a defining feature of this syndrome, differentiating it from other conditions that may involve vascular malformations or tumors. Understanding this association is crucial in recognizing the broader implications of the vascular abnormalities seen in patients with Sturge-Weber Syndrome. The presence of the facial birthmark can be highly indicative of the syndrome and is often one of the first clinical signs noted at birth.