501: Appendiceal abscess in anterior pararenal space
502: Non-Hodgkin's lymphoma, sandwich sign
503: Non-Hodgkin's lymphoma, sandwich sign
504: Non-Hodgkin's lymphoma, hepatic 84 splenic involvement
505: Immunoblastic lymphoma
506: Interval progression of adenopathy
507: Nodular lymphoma
508: Lymphosarcoma, hepatic and splenic involvement
509: Metastatic adenocarcinoma
510: LUQ mass (mycosis fungoides)
511: Retroperitoneal fibrosis
512: Gastric varices
513: Portal venous hypertension
514: Abdominal aortic aneurysm
515: Acute retroperitoneal hematoma
516: Abdominal aortic aneurysm, bilateral psoas hematomas
517: Infected synthetic aortic graft
518: Iliac artery aneurysm
519: IVC obstruction by chronic thrombus
