<prompt> In IVP, Adder head appearance is seen in:Polycystic kidneyHorse shoe kidneyUreteroceleHydronephrosis  <response>: Ureterocele is a cystic dilatation of the distal ureter. Cobra head or Adder head appearance is diagnostic of ureterocele. Spider leg appearance in polycystic kidney. Ref: Bailey Love, 25th Edition, Page 1290 