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THORACIC
CIRCUMFERENCE |
- Measurements of thoracic circumference vary from series to series due to:
- Differences in the plane of section used.
- Differences in the amount of skin and subcutaneous tissue included in the measurement. Some series include skin and subcutaneous tissues of the thorax in their measurement while others measure at the outer, mid or inner perimeter of the rib cage.
- We measure the thoracic circumference at the level of the four chamber view of the heart and exclude the skin and subcutaneous tissues as:
- The size of the thoracic cage and probably not the soft tissues affects underlying lung development.
- Abnormalities affecting the thoracic cage such as achondrogenesis or thanatophoric dysplasia produce thickening of the subcutaneous tissues which would tend to overestimate the thoracic circumference
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