[Spinal stenosis in hypochondroplasia and achondroplasia].

The conditions of generalized skeletal dysplasia, hypochondroplasia and achondroplasia, are reviewed. Both of these diseases may be complicated by spinal stenosis. The spinal complications are illustrated by a case history in which the basic disease was hypochondroplasia with secondary cervical spondylosis, narrow foramen magnum and clinical spastic paraplegia.