<prompt> Cobra snake head appearance is seen in -RectoceleUreterocelePosterior urethral valveBladder tumour  <response>: Ans. is b i.e., Ureterocele Cobra head sign Adder head or Snake appearanceo The cobra head sign is characterized by bulbous dilatation of distal end of the ureter with a surrounding radiolucent halo, seen within the contrast material enhanced bladder on intravenous urograms IVP.o The cobra head sign is classically seen with an intravesical orthotopic ureteroceleo A cobra - shaped distal end of a ureter may be seen with incomplete distal ureteral obstruction caused by a tumor or stone. This appearance is termed as pseudoureterocele. 