Identify the following condition: In retroperitoneal fibrosis, what are the CT findings? In retroperitoneal fibrosis, what are the MRI findings? List four causes of retroperitoneal fibrosis. List seven causes of medially displaced ureters. What are bifid (duplicated) collecting systems? What is a circumcaval (retrocaval) ureter? What is the Weigert-Meyer rule? What is the cobra head sign, and how is it demonstrated? What is the most common complication associated with circumcaval ureter? Which ureter is likely to show a vascular impression in the case of a dilated or thrombosed ovarian vein? Book traversal links for Ureteral displacement ‹ Which types of renal calculi are not opaque on plain films? Up Identify the following condition: ›