Retroperitoneal primary mucinous adenocarcinoma: A case report.

Retroperitoneal primary mucinous adenocarcinoma (RPMA) is extremely rare and the histogenesis of this tumor remains unclear. There is no consensus on the appropriate treatment for RPMA. Surgical resection is standard for the treatment of RPMA, whereas the benefits of chemotherapy with regard to this tumor remain to be established. This case report concerns a 21-year-old female individual with RPMA. The patient initially presented with chronic lower back pain and weight loss. Additionally, carcinoembryonic antigen (CEA) levels were found to be elevated. A computed tomography scan revealed a mass in the abdominal cavity. Consequently, laparotomy was performed, which revealed a well-defined tumor in the right retroperitoneum. Chemotherapy as a monotherapy was not considered as a viable treatment option. Therefore, the patient was initially administered a combined treatement of oxaliplatin and 5-fluorouracil. This treatment was then changed to paclitaxel and 5-fluorouracil. Findings showed a decrease in the CEA serum levels, indicating that this combination treatment may be efficacious in the treatment of RPMA since local recurrence following surgical resection was well controlled with chemotherapy.