Lumbar rib

Assoc Prof Craig Hacking and 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 be unilateral or bilateral. Lumbar ribs are mostly an asymptomatic incidental finding. 

Anatomy: Spine
Anatomy: Thoracic

Anatomy: Thoracic

Article information

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

Support Radiopaedia and see fewer ads

Cases and figures

  • Case 1: bilateral (CT)
    Drag here to reorder.
  • Case 2
    Drag here to reorder.
  • Case 3
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.