<prompt> Cobra head appearance is described for ?BPHBladder tumorVesical calculusUreterocele  <response>: Ureterocoele shows cobra head or adder head appearance in Excretory urography . Ureterocele is cystic enlargement of intramural ureter thought to result from congenital atresia of ureteric orifice. Female : Male is 4:1 . Similar to ectopic ureter , ureterocele frequently drain the upper pole and are associated with nonfunctional kidney . Present with infection in children and stones in adults . IVU is infrequently done now , Cystoscopy is diagnostic :-Translucent cyst enlarging and collapsing as urine flows in from upper ureter. Treatment in uncomplicated cases is exision and reimplantation. Endoscopy diathermy incision for symptomatic ureterocoele. Advanced UL cases with hydronephrosis or pyonephrosis , NEPHRECTOMY. Bailey 27th , chap 76 , pg no 1401 