The cobra head sign.
Chavhan
Govind B
GB
Department of Radiology, Seth G.S. Medical College and King Edward Memorial Hospital, Parel, Mumbai 400012, India.
D006801:Humans; D014518:Ureterocele / Q000000981:diagnostic imaging*; D001743:Urinary Bladder / Q000000981:diagnostic imaging; D014567:Urography