Ureteroceles are abnormal congenital dilatation of the most distal portion of the ureter. The dilated portion of the ureter may herniate into the bladder due to the abnormal structure of vesicoureteric junction (VUJ).
Intravesical ureterocele also called simple ureterocele : occur at the normal VUJ position ( incidence about 25 % ).
Extravesical ureterocele also called ectopic ureterocele: occur ectopically low and medial, near bladder neck/urethra ( incidence about 75 % ).
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