Caput succedaneum.
DWI shows global ischemia in both cerebral hemispheres. Cerebral edema with resultant narrowed ventricles and sulci and barely discernible supratentorial cisterns. The superior portion of the brainstem and the superior aspect of the vermis are ischemic as well. The cerebellar hemispheres, pons and medulla appear normal.
Negative lactate peak at 1.4 ppm on MRS (not shown).
No parenchymal hematoma. A small subdural hematoma can be missed on SWI.
Normal signal in all the large intracranial vessels.