Pseudohydronephrosis

Pseudohydronephrosis (plural: pseudohydronephroses) refers to normal anatomy or non-significant pathologies that may mimic hydronephrosis. There is usually fluid-density material within a dilated part of the urinary tract, but without other signs of obstruction such as retroperitoneal fat stranding, renal perfusion abnormality, or renal enlargement.

Causes include :

• parapelvic cysts
• extrarenal pelvis
• pregnancy related hydronephrosis
• renal sinus varices
• bladder distension