Abstract
Background: The retroperitoneum (RP) may be affected by variety of infectious, inflammations and tumors including benign and malignant ones. Although primary malignant tumors are the most prevalent tumors in this anatomic area, metastatic and invasive tumors rarely involve retroperitoneum. Gastrointestinal stromal tumors (GISTs) counted the most common tumors with invasion the retroperitoneum, but to our knowledge it is time that a surgery team encountered the appendiceal tumor as a huge retroperitoneal mass.
Case presentation: A 68 years old man referred to emergency department with abdominal distension and weight loss. In his course of hospitalization, a huge right retroperitoneal mass was detected by CT scan and thereafter the patient underwent laparotomy, evacuation of massive mucinous tissue located in right retroperitoneum and right hemicolectomy due to appendiceal tumor. Histopathological exam showed ’mucinous appendiceal neoplasm’.
Conclusions: this is the first case study that appendiceal tumor had invaded visceral peritoneum into the retroperitoneum, so, an invasion of peritoneal tumor to retroperitoneum should be considered when an urologist approaches to retroperitoneal mass.
Keywords: Appendiceal tumor, Multiloculated mucinous collection, Retroperitoneal mass