We report a rare case of metastatic anaplastic thyroid carcinoma to the small intestine causing intussusception. A 41-year-old man admitted to our hospital complaining abdominal pain and general fatigue. Abdominal ultrasonography and computed tomography represented target signs in the abdominal cavity, which was diagnosed as intussusception of the small bowel. We conducted an emergency laparo-scopic operation. Repositioning the intussusception, necessitating partial small bowel resection was performed for the two sites of the small bowel. Tumors were observed in the jejunum 50 cm distal to the Treitz ligament and in the ileum 200 cm proximal to the ileocaecal valve. They were hi stop athologic ally confirmed as anaplastic carcinoma that metastasized from thyroid carcinoma.
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