Lumbar rib

Dr Henry Knipe et al.

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 unilateral or bilateral. Lumbar ribs are mostly an asymptomatic incidental finding. 


Spinal anatomy
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Article Information

rID: 25709
Section: Anatomy
Synonyms or Alternate Spellings:
  • 13th rib
  • Thirteenth rib
  • Lumbar ribs

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Cases and Figures

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    Case 1: bilateral (CT)
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    Case 2
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    Case 3
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