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Congenital absence of a pedicle of a lumbar vertebra.

There have been several reports of congenital absence of a pedicle of a cervical vertebra (Hadley, 1946; Oestreich and Young, 1969; Steinbach, Boldrey and Sooy, 1952; Wilson and Norrel, 1966). Bardsley and Hanelin (1971) have described two cases of congenital hypoplasia of a lumbar vertebral pedicle. We have been unable to find in the literature, however, any reference to total absence of a pedicle in the lumbar region. The following report illustrates such a case. The patient was a 32-year-old Negro male who presented in the hospital casualty department having been involved in a motor car accident. He was complaining of pain in the back, radiating into both buttocks.