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What is Adder head is seen in- and explain in detail?
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.