Ureterocele is a submucosal cystic dilation of the terminal segment of the ureters.

Single system ureteroceles are those associated with a single kidney, a single collecting system, and a solitary ureter.

Duplex system ureteroceles are associated with kidneys that have a completely duplicated collecting system and two ureters.A ureterocele associated with the upper pole moiety is located medially and inferiorly to the lower pole ureter inserting in a more superolateral location (Weigert-Meyer rule)

Orthotopic ureterocele is a ureterocele whose orifice is located in a normal anatomic position within the bladder.

Ectopic ureterocele refers to those ureteroceles whose orifices are located in an ectopic position, such as the bladder neck or urethra. .

 

Ureterocele is seen as a fluid-filled intravesical mass. It is also known as \"cyst within a cyst.\"

Hydroureteronephrosis

Adder-head appearance of the distal ureter is classical and is diagnostic of ureterocele.
Ureterocele appears as a smooth, round filling defect along the base of the bladder

Percutaneous nephrostomy drainage allows decompression of a dilated renal pelvis prior to definitive treatment of the ureterocele.