Situs classification (plural: sitūs) or body situs 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 the normal configuration
- situs ambiguus (heterotaxy): 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.
- 1. Maldjian PD, Saric M. Approach to dextrocardia in adults: review. AJR Am J Roentgenol. 2007;188 (6): S39-49. doi:10.2214/AJR.06.1179 - Pubmed citation
- 2. Applegate KE, Goske MJ, Pierce G et-al. Situs revisited: imaging of the heterotaxy syndrome. Radiographics. 19 (4): 837-52. Radiographics (full text) - Pubmed citation