Spinal extradural cyst and kyphosis dorsalis juvenilis

Kyphosis dorsalis juvenilis is a not uncommon disease, the etiology of which is entirely unknown. Extradural cysts of the spinal cord which give rise to symptoms during adolescence are almost always associated with deformities of the thoracic spine, usually a kyphosis of this type. The association of these two conditions was first drawn to our attention by the following case. The recognition of this association is of value, not only because of its aid in the diagnosis and prompt treatment of these benign cysts, but also because of the light which it throws upon the etiology of the commoner kyphosis dorsalis juvenilis not associated with such cysts.