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A previously healthy 18-year-old woman presented with a 5-month history of pain in the left upper quadrant of the abdomen, abdominal distention, postprandial emesis, and weight loss of 18 kg. Physical examination revealed a firm, tender, epigastric mass but was otherwise unremarkable. Computed tomography showed a large gastric mass extending from the fundus to the antrum (Panel A, arrow), with no indication of obstruction of the gastric outlet. Esophagogastroduodenoscopy revealed a large bezoar occluding nearly the entire stomach, without extension into the duodenum (Panel B). On questioning, the patient stated that she had had a habit of eating her hair . . .