<prompt> A neonate presents with features of hea failure. On examination anterior fontanelle was found to be bulging. On auscultation, a cranial bruit was heard. A CT angiography done showed the following: Which vessel is mainly involved in this abnormality?Median prosencephalic veinVein of GalenEntire circle of willisChoroid plexus  <response>: - History of features of hea failure, bulging anterior fontanelle, cranial bruit image given suggests the diagnosis of VEIN OF GALEN MALFORMATION - Vessel involved is - Median prosencephalic vein of markowsky precursor of vein of Galen - Onset - 11-13 weeks of gestation 