A group of rare arteriovenous malformations characterized by unilateral vascular malformations in a metameric distribution involving the craniofacial region. Subtypes differ according to the distribution of lesions, with cerebrofacial arteriovenous metameric syndrome (CAMS) 1 (medial prosencephalic group) involving the hypothalamus and nasal region, Wyburn-Mason syndrome (lateral prosencephalic group) involving the occipital lobe, thalamus, and maxilla, and CAMS 3 (lateral rhombencephalic group) involving the cerebellum, pons, and mandible. [from
ORDO]