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