Abstract
We report the case of a 75-year-old man suffering from metachronous adenocarcinoma arising at a colostomy site with inguinal lymph node metastasis. The patient first visited our hospital complaining of fever and a hard, swollen mass at the colostomy site. Physical examination and computed tomography revealed a tumor at the colostomy site invading into the skin with adjacent infection and left inguinal lymph node metastasis. We performed radical resection including colostomy and resection of surrounding organs, total left inguinal lymph node dissection, and reconstruction of a colostomy at another site. Pathological examination revealed well-differentiated adenocarcinoma invading the surrounding skin, and no lymph node metastases around the colostomy. One metastasis was detected in the dissected inguinal lymph nodes. Adenocarcinoma arising at a site of colostomy with inguinal lymph node is very rare, but total surgical resection should be considered when possible to obtain better outcomes, even if inguinal lymph node metastasis is present.
