Low-grade mucinous neoplasm originating from intestinal duplication: A case report and review of the literature

Background Low-grade mucinous neoplasms originate from the appendix. It is typically characterized by a low-grade mucus columnar epithelial cells lined smooth muscle, compared to normal intestinal mucosa, losing submucosa. However, unusual origin can occur, as noted in this case report. Case demonstration Herein, we reported a 33-year-old male with physical examination revealed abdominal mass. A computed tomography (CT) scan revealed a cystic mass between the pancreatic tail and the adjacent bowel duct, with an obvious enhancement of the cyst wall in enhanced scanning. Subsequently, the patient underwent surgical laparoscopic resection of masses and the resected sample was sent for pathological biopsy. According to the results, the pathology was consistent with the histological morphology and immunohistochemical characteristics of the low-grade mucinous tumors arising from intestinal duplication. 3.5 years post-resection, the patient returned to the hospital for re-examination that abdominal CT and blood tumor markers showed no signs of tumor recurrence. The case report is aimed to enhance the clinical recognition of the low-grade mucinous tumors arising from intestinal duplication and improve preoperative diagnosis rate and misdiagnosis rate. Conclusion The low-grade mucinous tumorsoriginate from the appendix mostly. This case resulted from an unusual derivation from intestinal duplication.