Situs classification

Dr Tim Luijkx and A.Prof Frank Gaillard et al.

Situs classification can be a daunting topic, but it falls into three main groups :

  1. situs solitus: the normal configuration of thoracic and abdominal organs
  2. situs inversus: mirror image of normal
  3. 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.

When situs solitus and situs inversus occur, the atrial situs always corresponds to the visceral situs. In situs ambiguous, the bronchial anatomy always corresponds to the atrial situs.

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Article information

rID: 2053
Tag: stub
Synonyms or Alternate Spellings:
  • Situs classification system
  • Situs anomalies

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Cases and figures

  • Case 1: dextrocardia
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  • Case 2: situs inversus
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  • Case 3: situs ambiguous
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