2016 Volume 49 Issue 3 Pages 242-249
A 64-year-old man with melena consulted our hospital, and was subsequently hospitalized. Colonoscopic examination showed a type 1 tumor in the sigmoid colon, and a biopsy indicated well-differentiated adenocarcinoma. Abdominal contrast-enhanced CT images did not show the tumor in the sigmoid colon, and showed no swelling in the lymph nodes, or metastasis. Laparoscopic sigmoidectomy with D2 dissection was performed. Pathological examination indicated pMP, pN1, M0: fStage IIIa, which was mainly composed of invasive micropapillary carcinoma (95%), as well as well-differentiated adenocarcinoma (5%). Postoperative adjuvant chemotherapy was performed. The patient is alive at 7 postoperative months with no recurrence. Invasive micropapillary carcinoma has a high incidence of invasive lymph node and lymphoid metastasis, and the prognosis is poor. Reports of invasive micropapillary carcinoma are very rare. This case requires careful follow-up.
