Bifid or forked ribs are uncommon. They are thought to occur in ~0.2% of the population and there may be a female as well as right-sided predilection 2.

Clinical presentation

Usually asymptomatic, they may cause musculoskeletal pain or intercostal nerve entrapment. A bifid first rib is an uncommon cause of thoracic outlet syndrome.

Pathology

Associations

Bifid ribs can be seen in Gorlin (nevoid basal cell carcinoma) syndrome.

Thoracic anatomy
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Article Information

rID: 990
Section: Anatomy
Tags: refs, variant
Synonyms or Alternate Spellings:
  • Forked rib
  • Bifid ribs
  • Forked ribs

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Cases and Figures

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    Case 1: left 6th bifid rib
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    Case 2: left 4th anterior bifid rib
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    Case 3: ultrasound - bifid right 3rd rib
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    Case 4: right 5th bifid rib
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    Case 5
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    Case 6
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    Case 7
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