Newborn with hydrocephalus on prenatal US Pediatric Imaging Neurological May 17, 2024April 20, 2024 Axial (above), sagittal (below left), and coronal (below right) T2 MRI without contrast of the brain shows dilation of the lateral and third ventricles. The cerebellum is small in size and there is a large and fluid-filled posterior fossa. The diagnosis was Blake pouch cyst. Related Published May 17, 2024April 20, 2024