spina bifida occulta

noun
spina bifida oc·​cul·​ta | \ -ə-ˈkəl-tə How to pronounce spina bifida occulta (audio) \

Medical Definition of spina bifida occulta

: a mild often asymptomatic form of spina bifida in which there is no hernial protrusion of the meninges or spinal cord

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