Abstract
The classification of an appendiceal mucinous tumor is controversial. Low-grade appendiceal mucinous neoplasm (LAMN) is newly classified in the Japanese Classification of Colorectal Carcinoma, Eighth Edition. Here, we report a case of LAMN. A 90-year-old woman suspected to have ileocecal abscess was admitted to our hospital. Abdominal computed tomography showed cystic dilatation of the appendix to 7.5 cm in diameter. We diagnosed appendiceal mucinous tumor and performed ileocecal resection with lymph node dissection (D2) because the possibility of mucinous cystadenocarcinoma could not be ruled out. Mucus was accumulated within the lumen. The pathological diagnosis indicated LAMN. Recent research has found that LAMN is potentially malignant ; however, a treatment strategy has not been established. Therefore, appropriate surgical intervention with careful postoperative surveillance should be considered.
