To the Editor: We report a case of a vascular malformation involving the right posterior subiculum and contiguous hippocampus, which was discovered incidentally at autopsy in a 52-year-old woman with lifelong history of mental illness and mild intellectual disability who died as a result of cardiorespiratory arrest and acute global anoxic/ischemic encephalopathy. As per family, patient was born by forceps delivery, and her cognitive deficit was attributed to an intrapartum brain injury. Psychiatric disturbances included dependent personality disorder, depression, and obsessive-compulsive disorder. Before her death, the patient was on valproic acid/divalproex 250 mg bid, quetiapine 200 mg–300 mg once daily, and fluoxetine 20 mg. Her medical history was also significant for colitis (not further defined), hypercholesterolemia, and obesity. There was no history of seizures, attention-deficit hyperactivity disorder, cerebral palsy, or Prader-Willi syndrome.