(A) CTG tracing. Sudden decelerations (arrow) that do not recover: urgent delivery ("rescue") is indicated. This tracing permits the diagnosis that the fetus (40ws.) suffered an acute, rather profound, ischemic event just prior to delivery due to the mother's prolonged cardiac arrest. (B-C) Same case as in (A): CT (midventricular level) appearance with enlarged lateral ventricles and generalized brain swelling at autopsy. (D) Histology of the cortical layer shows it to be oedematous with nuclear pyknosis.