Meningomyelocele and progressive hydromyelia. Progressive paresis in myelodysplasia.

Five cases of myelodysplasia with progressive paraparesis are presented. Three of the five patients developed spasticity, but dissociated sensory loss and loss of sphincter control was not a prominent feature. All were found to have compensated hydrocephalus and extensive communicating hydromyelia. The use of myelography and ventriculography in the diagnosis of hydromyelia is discussed. Ventricular drainage led to clinical improvement in two cases and radiological improvement in one. The relationship of compensated hydrocephalus, meningomyelocele, and progressive hydromyelia postnatally may support the hydrodynamic hypothesis of myelodysplasia.