MRI – A 2 cm wide, well-delineated piece of bone is elevated dorsally from the left parietal bone (assumed iatrogenic from prior craniotomy). Part of the left cerebral hemisphere including the parietal lobe and the lateral ventricle are herniated through the bone defect. The brain parenchyma, both lateral ventricles and the third ventricle present longitudinal stretch towards the defect. The cerebral falx is shifted to the left. The entire left cerebral hemisphere presents diffuse T2-hyperintense edema. Extensive periventricular ill-defined white matter T2-hyperintensity is seen within the right cerebral hemisphere.