Toddler with a big head Pediatric Imaging Neurological July 12, 2022June 16, 2022 Axial T2 MRI without contrast of the brain shows a diffusely enlarged subarachnoid space being crossed by subarachnoid vessels. The ventricular system is normal in size. The diagnosis was benign enlargement of the subarachnoid space. Related Published July 12, 2022June 16, 2022