AN OPERATED CASE OF RECTAL CARCINOID WITH LOCAL RECURRENCE

Abstract

The authors report an operated case of rectal carcinoid with local recurrence 40 months after a transanal resection in a 66-year-old man. There was a previous history of undergoing a transanal polypectomy for a rectal tumor measuring 19mm with a central depression at another hospital. The tumor was rectal carcinoid, carcinoid cells were confined to the submucosa and the vascular invasions were negative. Forty months after the resection, he was referred to the hospital because of local recurrence. As no distant metastasis was found, a low anterior resection was performed. The tumor was 40×28mm in size growing outside the muscularis propria and was thought to be regional lymph node recurrence. Definite structural anaplasia and evidence of invasions were found in the recurrent tumor which were not seen in the primary tumor. An increasing malignancy was indicated in this case. We rarely encounter a local recurrence of rectal carcinoid. And it is interesting that the recurrent tumor disclosed histologic characteristics like endocrine cell carcinoma, whereas the primary tumor was diagnosed as classical carcinoid.