A 23-year-old woman with a history of an eating disorder complains of vomiting, nausea, and severe abdominal pain. Physical examination shows abdominal distension and constipation. An X-ray film of the abdomen reveals air-fluid levels and a hyperlucent shadow at the epigastric area. The material obstructing the gastrointestinal tract is removed surgically and shown. Which of the following is the most likely diagnosis?
Diverticulum of the stomach Gastric lymphoma Phytobezoar Trichobezoar