Preferred Label : cobra head sign;
RADLEX synonyms : cobra head ureter; spring onion sign; snake head ureter;
Definition : Dilated distal ureter surrounded by relatively lucent halo, resembling the head of
a snake. Indicates intravesicular ureterocele. Dilatation results from obstruction
of urine flow, and lucent halo is produced by double-sided ureteral mucosal projection
into bladder.;
Source : Radiology 2002; 225:781-782;
Origin ID : RID35090;
Associated condition(s)
Dilated distal ureter surrounded by relatively lucent halo, resembling the head of
a snake. Indicates intravesicular ureterocele. Dilatation results from obstruction
of urine flow, and lucent halo is produced by double-sided ureteral mucosal projection
into bladder.
