Situs classification can be a daunting topic, but it falls into three main groups :
- situs solitus: the normal configuration of thoracic and abdominal organs
- situs inversus: mirror image of normal
- situs ambiguus: an intermediate configuration with duplication (isomerism)
Situs is best thought of as a spectrum with situs solitus and situs inversus at either end of the spectrum. Situs ambiguus, as the name suggests, falls somewhere between the two ends of the spectrum.
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