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Table 1 Methodological approach for determination of type of isomerism

From: Heterotaxy syndrome with mixed bronchopulmonary malinosculation: an unusual case report

Step 1: Look at the bronchial situs


 Bilateral Eparterial bronchi


 Bilateral hyparterial bronchi


Step 2: Look at the bi-atrial morphology (on the basis of appendage which is broad in right atrium and narrow/tubular in left atrium)


Step 3: Look at the splenic status





  1. Bilateral eparterial bronchi with bilateral right atria and asplenia—Right isomerism
  2. Bilatral hyparterial bronchi with bilateral left atria and polysplenia—Left isomerism