to her community hospital with disorientation, word-finding difficulty, left-sided hemineglect,
and decreased short-term memory function. The medical workup was nonrevealing. Her
medical history was remarkable for hypertension, diverticulitis, and a sigmoid colectomy 18
months previously for a colonic tubular adenoma. A computed tomographic (CT) scan of the
head without contrast revealed a left frontal mass lesion and a right parietal lucency (Fig. 1) …