[A Case of Goblet Cell Carcinoid of the Appendix Invading Directly into the Sigmoid Colon]

A 73-year-old man underwent a screening colonoscopy, and a depressed lesion in the sigmoid colon was detected. Biopsy revealed a Group V lesion, and he was diagnosed with sigmoid colon cancer. During surgery, there was dense adhesion of the appendix to the sigmoid colon, and sigmoidectomy combined with appendectomy was performed. However, pathological examination revealed goblet cell carcinoid of the appendix with direct invasion into the sigmoid colon. To the best of our knowledge, no similar cases have been reported in Japan. Additional surgery with lymph node dissection was recommended, but it was rejected by the patient. For adjuvant chemotherapy, a total of 8 courses of capecitabine plus oxaliplatin therapy were administered. To date, the patient is alive without recurrence 2 years postoperatively. Postoperative adjuvant chemotherapy for goblet cell carcinoid of the appendix is a useful option for cases in which additional surgery cannot be performed.