Lumbar rib

Last revised by Mostafa El-Feky on 7 Oct 2021

Lumbar (or 13th) ribs are a rare anatomical variant and represent transitional vertebrae at the thoracolumbar junction with a prevalence of ~1% 1. It presents as an additional rib coming off T13 or L1 (depending on numbering classification) and may be unilateral or bilateral. Lumbar ribs are mostly an asymptomatic incidental finding. 

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Cases and figures

  • Case 1: bilateral (CT)
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  • Case 2
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  • Case 3
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  • Case 4: on right
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