"type I: unilateral agenesis localised to sacrum or coccyx"
"type II: partial agenesis with bilateral defects; the iliac bone articulates with S1, but the distal sacral elements fail to develop"
"type III: total sacral agenesis; iliac bones articulate with the lowest lumbar element"
"type IV: total sacral agenesis; iliac bones fuse posteriorly"
"See also "
"Currarino triad"
Expected headings
"Associations"
"See also "
"type II: partial agenesis with bilateral defects; the iliac bone articulates with S1, but the distal sacral elements fail to develop"
"type III: total sacral agenesis; iliac bones articulate with the lowest lumbar element"
"type IV: total sacral agenesis; iliac bones fuse posteriorly"