Supernumerical 13th rib (lumbar rib)
Abdominal pain. No other symptoms.
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Supernumerical right lumbar rib with rudimentary appereance, or 13th rib.
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
- 1. Foley WJ, Whitehouse WM. Supernumerary thoracic ribs. Radiology. 1969;93 (6): 1333-4. doi:10.1148/93.6.1333 - Pubmed citation
- 2. Deepak A, Lumbar rib: an uncommon causation of a common manifestation. Romanian Journal of Physical Therapy, VOL. 19/ NR 31/ 2013