Cobra snake head appearance is seen in -

Ans. is 'b' i.e., Ureterocele Cobra head sign (Adder head or Snake appearance)o 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.