system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Cobra head deformity is characterstic of –
assistant
The correct answer is  Cobra head (Adder head) ureteric orifice is seen in ureterocoel (mc. cause), stone, tumor and following retrograde catheterization.