Spina bifida occulta overlain by a giant naevus. Spina bifida is a congenital defect whereby some of the vertebrae fail to develop completely, leaving part of the spinal cord exposed. Spina bifida occulta is the most common and least severe form This is characterised by a tuft of hair or a dimple over the abnormal spinal area. There is hair here Symptoms can develop at any time and include incontinence, leg weakness and cold feet. The dark patch of skin is a naevus, or skin blemish.
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