system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A neonate with left to Right shunt & high cardiac output heart failure. CT Angiography of the neonate is shown. What is the diagnosis?
assistant
The correct answer is  b. Vein of Galen malformationCT angiography shows enhancing rounded lesion at tentorial apex, extending posteriorly & draining into dilated superior sagittal sinus, through dilated straight sinus, suggestive of vein of Galen malformation.The anomaly is actually due to a cerebral arteriovenous fistula of the median prosencephalic vein (a precursor of the vein of Galen) occurring at 6-11 weeks gestation.