[A case of retroperitoneal abscess accompanying pregnancy].

A 40-year-old pregnant woman, who suffered a continuous episode of fever and anemia since the 26th week of pregnancy, was referred to our clinic for evaluation of her left flank pain and tumor. As retroperitoneal tumor was suspected by retrograde pyelography, sonography and CT, translumbar tumorectomy was performed under general anesthesia. The histological diagnosis was retroperitoneal abscess.