Hypoplastic lumbar pedicle in association with conjoined nerve root MRI demonstration.

We report a case of aberrant hypoplastic pedicle of the fourth lumbar vertebra and ipsilateral conjoined nerve root. Ipsilateral retroisthmic laminar defect, dysplastic lamina and transverse process, enlargement of neural foramen, hypoplasia of superior and inferior articular facet were present as associated with other neural arch anomalies. The extent of these anomalies was well demonstrated by MR imaging.