Omphalomesenteric duct remnant adenocarcinoma in adults: a case study

INTRODUCTION: The omphalomesenteric duct (OMD) or the vitelline duct (VD) is the embryonic structure connecting the vitelline sac to the primitive gut. It undergoes obliteration at 5–9 weeks of gestation. Failure of this duct to close, which occurs in approximately 2% of the population, can lead to various types of VD residual diseases. A persistent OMD remnant is pathological, and it typically presents in the pediatric population. Meckel diverticulum is the most common anomaly that results from failure of resorption of the OMD. In extremely rare instances, OMD remnant adenocarcinomas have been reported in the adult population. CASE DESCRIPTION: In this study, we present a case of OMD remnant adenocarcinoma with axillary lymph node metastases in an adult male. DISCUSSION AND EVALUATION: Because OMD remnant adenocarcinoma is rare, few relevant studies have been reported. The final diagnosis of navel VD residual adenocarcinoma depends on postoperative pathology and immunohistochemical analysis. The follow-up treatment in OMD is similar to the chemotherapy regimens of postoperative gastrointestinal malignant tumors. CONCLUSIONS: In this report, the patient experienced no complications after surgery and was discharged on the seventh postoperative day, followed by 12 courses of postoperative FOLFOX6 scheme chemotherapy. By the end of chemotherapy, the patient had no evidence of recurrent disease and metastasis across the reexamination of PET–CT.