This document summarizes information about Galen vein aneurysms, including: - It describes three main clinical presentations: newborns, infants, and adolescents/adults. Newborns often present with macrocephaly and prominent frontal veins. - Diagnostic studies include ultrasound, MRI, angiography to classify the aneurysm type and assess for an adjacent arteriovenous fistula or malformation. - Treatment has evolved from no treatment historically to open surgery starting in the 1940s, with endovascular embolization now also used starting in the late 1980s/early 1990s. Prognostic scales help guide treatment planning and predict outcomes.