disease has location arteriovenous hemangioma/malformation cerebral hemangioma vein disorder vein of Galen aneurysm https://github.com/monarch-initiative/mondo/issues/8567 https://rarediseases.info.nih.gov/diseases/5467/vein-of-galen-aneurysm https://www.malacards.org/card/vein_of_galen_aneurysmal_malformation MESH:C536535 NCIT:C98642 MEDGEN:140912 MONDO:0015196 Orphanet:1053 vein of Galen arteriovenous malformations Galen vein aneurysm icd11.foundation:1884295064 Galenic arteriovenous malformation SCTID:253194008 vein of Galen aneurysm malformation VGAM ectasia or varix of the vein of Galen UMLS:C0431420 GARD:0005467 Vein of Galen aneurysm is a rare formof arteriovenous malformation in which the embryonic precursor to the vein of Galen, a vein at the base of the brain, dilates causing too much blood to rush to the heart. This can lead to rapid heart failure. Other features may include increased head circumference resulting from hydrocephalus, unusually prominent veins on the face and scalp, developmental delay, persistent headache, and other neurological findings. Vein of Galen aneurysm is often recognized on an ultrasound late in pregnancy. In other cases, it is diagnosed after birth. Although the exact cause remains unknown, this condition appears to result from a defect in early fetal development. Treatment is aimed at decreasing the blood flow through the malformation while maximizing the blood supply to the brain. Minimally invasive surgical techniques are preferred, such as endovascular embolization. great cerebral vein