Abstract
In 1984 Castellvi et al formulated a radiographic classification system describing 4 types of lumbosacral transitional vertebra (LSTV) on the basis of morphologic characteristics. The association of LSTV with accelerated degeneration of the disc above has been described extensively. Elster found the overall incidence of structural pathology no higher in patients with LSTV, but emphasized the proportion of prolapses in the interspace immediately above the transition. LSTV has been reported as a cause for extraforaminal entrapment of the L5 nerve root between the transverse segment of the LSTV and the sacral ala optimally demonstrated by coronal MRI.
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