<prompt> Cobra head deformity is characterstic ofPosterior urethral valveCarcinoma of bladderBladder tumorUreterocele  <response>: A ureterocele is a congenital abnormality found in the ureter. In this condition the distal ureter balloons at its opening into the bladder,forming a sac-like pouch. It is most often associated with a duplicated collection system, where two ureters drain their respective kidney instead of one. 