spina bifida
abnormal vertebral arch development
spina bifida occulta
MP:0005297
MPheno.ontology
closed spinal bifida
cryptomerorrhachischis
defective closure of the laminae of the vertebral column in the lumbosacral region without hernial protrusion of the spinal cord or meninges; the mildest, most common and often asymptomatic form of spina bifida, identified externally by a skin depression or dimple, dark tufts of hair, telangiectasis, or soft subcutaneous lipomas at the site of defect
hidden spina bifida
occult spina bifida