HighlightsMeckel' diverticulum is the most common congenital anomaly of the small intestine.It is a relatively not rare disease in the clinical field.But the presentation as a retroperitoneal abscess as complications of Meckel's diverticulum is a very rare clinical entity. In this report,.We present a 31-year-old man with perforated Meckel's divertculum with retroperitoneal abscess.I also reviewed other disease of retroperitoneal abscess. (As I known as, This case report is the first report including review of retroperitoneal abscess).