A 62 y.o. male sustains an out of hospital cardiac arrest with prolonged CPR and eventual ROSC.  A CT scan of the brain is obtained. What's the diagnosis? (scroll down for answer) 

Answer:  Cerebral Edema

• Loss of distinction between the gray and white matter.
• It may predict poor outcome after anoxic brain injury, but there is insufficient evidence to recommend CT scan alone for neuroprognostication after cardiac arrest. Click here for more information
• Emergent CT scan after ROSC is helpful to rule out trauma and non-cardiac causes of arrest.