Sacralization of L5

Case contributed by Dr Bruno Di Muzio


Lower back pain.

Patient Data

Age: 60
Gender: Female

CT Lumbar spine


CT scan shows four rib-free lumbar type vertebral and one transitional vertebrae characterized to assimilation of L5 to the sacrum. There is also rudimentary T12 ribs.


There are four rib-free lumbar type vertebrae and one transitional vertebrae characterized to assimilation of L5 to the sacrum (TV). There is also rudimentary T12 ribs.

Case Discussion

Assimilation of L5 to the sacrum is more common than lumbarization of S1, occurring in ~17% of the population. 

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