Reactions and serologic responses after administration of inactivated monovalent influenza A/swine virus vaccines. I. Immunization of children and adults with influenza A/Shope virus vaccines.

Reactivity and immunogenicity of three inactivated, zonally purified, monovalent influenza A/swine virus vaccines were studied in children and adults. Each dose of vaccine contained either 400 chick cell-agglutinating (CCA) units/0.5 ml or 200 CCA units/0.

Degenerative spondylolisthesis with an intact neural arch.

Whereas the skeletal, anatomic, and clinical aspects of this condition have been scrutinized in detail, the radiologic changes have received less attention. In this discussion the plain film changes are briefly reviewed, and emphasis is directed toward the myelographic manifestations that reflect intraspinal and intraforaminal instrusions and their clinical sequelae.

Lumbar spondylolisthesis with isthmic defects.

The importance of spondylolisthesis, aside from the obvious malalignment and malformation of the affected vertebrae, rests mainly on the possibility and the extent of impairment of activity. In this discussion the authors are concerned mainly with the myelographic signs associated with spondylolisthesis in patients with isthmic changes.

Lumbar spinal stenosis.

Recognition and management of problems inherent in spinal stenosis require a clear understanding of the diverse anatomic changes, their radiologic representations, and careful correlation with a wide spectrum of fluctuating clinical manifestations. Although a common basis might be postulated for narrowing of the spinal canal, emphasis should be placed on its various forms.

Cervical spinal stenosis.

Cervical spinal stenosis occurs at the craniovertebral junction, usually incident to a congenital malformation, or it appears as a developmental defect with diffuse narrowing of the cervical canal. In its acquired form the lesion may be limited to one or two levels, or it may be more extensive and affect three or more segments.

Degenerative lumbar spondylolisthesis with an intact neural arch (pseudospondylolisthesis).

Twenty patients treated for degenerative spondylolisthesis with an intact neural arch principally at the L4-5 interspace had neural compression caused by dislocation of the vertebral bodies and intrusions of lamina and enlarged, arthrotic facets into a stenotic spinal canal. The resulting "pincer" effect caused complete or partial block demonstrable on myelography, with nerve root and cauda equina compression. Most of the patients were women aged 45-84 years.