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At the time the article was created Matt A. Morgan had no recorded disclosures.View Matt A. Morgan's current disclosures
At the time the article was last revised Daniel J Bell had no recorded disclosures.View Daniel J Bell's current disclosures
Supernumerary ribs occur most commonly as a cervical rib arising from C7 or a lumbar rib arising from L1. In extremely rare situations, there can be sacral, coccygeal, intrathoracic, or aberrant lumbar ribs 3. Rarely supernumerary ribs (cervical and lumbar ribs aside) have been found as 'normal' anatomic variants, without evidence of any clinical sequelae.
- Turner syndrome
- cleidocranial dysplasia
- Aarskog syndrome
- trisomy 8 syndrome
- incontinentia pigmenti
- fifteen thoracic vertebrae, each with a pair of ribs: isolated case report 5
Supernumerary ribs have been used as a marker for developmental toxicity bioassays in test animals 2.