2020 Volume 53 Issue 10 Pages 792-799
A 25-year-old man presented to our hospital due to sudden abdominal pain and lumbago pain. Results of blood test showed that the white blood cell count and C-reactive protein levels were high. Abdominal CT and MRI revealed a giant cystic mass in the retroperitoneum. As the clinical symptom of pain and inflammatory reaction were improved by administration of antibiotics, elective surgery was performed. During laparotomy, a giant cystic tumor with 10×15×7 cm in size was located in the retroperitoneum. Although it adhered to the second portion of duodenum and the inferior mesenteric artery, complete resection was achieved. The pathological findings showed that there were no malignant cells. On immunohistochemical staining, the cells along the cystic wall were positive for calretinin, mesothelin, and D2-40, and negative for Ki-67, leading to the diagnosis of retroperitoneal benign multicystic peritoneal mesothelioma. In this paper, we report this case of retroperitoneal benign multicystic peritoneal mesothelioma that was discovered due to acute abdomen.
