A surgical case of sporadic pediatric intra-abdominal desmoid tumor with multivisceral invasion

Abstract

Background: Intra-abdominal desmoid tumors are often associated with familial adenomatous polyposis (FAP). Here, we report the case of a sporadic pediatric patient.

Case: A 12-year-old girl presented with abdominal pain. Ultrasonography showed a 14-cm intra-abdominal mass. Imaging suggested an omental hematoma or leiomyoma, prompting surgery. The tumor had infiltrated the stomach, colon, and pancreatic surface; en bloc resection included distal gastrectomy, extended colectomy (ascending to descending colon), partial pancreatectomy, gastrojejunostomy, and colo-colonic anastomosis. Pathological examination confirmed desmoid-type fibromatosis. Colonoscopy revealed no polyps, and there was no family history suggestive of FAP. Postoperative celecoxib was administered for two years, and the patient remained disease-free for five years.

Conclusion: Non-FAP intra-abdominal desmoid tumors in children are rare, lacking standardized management. Individualized treatment with multidisciplinary planning and long-term follow-up is recommended.