A 60-year-old woman visited our department with the chief complaint of repeated nausea and abdominal pain. Abdominal contrast-enhanced computed tomography revealed circumferential jejunal wall thickening and dilatation of the oral end of the intestinal tract. Therefore, under the diagnosis of small intestinal ileus, she was hospitalized. Small intestinal endoscopy revealed a circumferential ulcerative lesion in the upper jejunum 14 cm from the ligament of Treitz. Biopsy revealed an adenocarcinoma, which led to the diagnosis of small intestinal cancer. No apparent metastasis was observed. Partial resection of the small intestine was performed. The pathological diagnosis was adenocarcinoma tub 2, 50×29 mm, T3 (SS) N0 M0 stage IIA. Postoperative adjuvant chemotherapy was not performed, and the patient has had no recurrence.
