Supernumerical 13th rib (lumbar rib)

Case contributed by Dr Antoni Boscà


Abdominal pain. No other symptoms.

Patient Data

Age: 25 years old
Gender: Female

Supernumerical right lumbar rib with rudimentary appereance, or 13th rib.

Case Discussion

Lumbar ribs are a rare anatomical variant with a prevalence of ~1%.

Lumbar ribs most commonly arise from first lumbar vertebra, although it has been reported to arise from the second, and third vertebrae. In extremely rare situations, there can be sacral, coccygeal, intrathoracic, or aberrant lumbar ribs.1-2.

This are mostly an asymptomatic incidental finding, but it has been mentioned that lumbar rib can result in pain in renal angle.3

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Case information

rID: 49923
Published: 11th Dec 2016
Last edited: 14th Dec 2016
Inclusion in quiz mode: Included

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