What is situs solitus?
In situs solitus the viscera are in their normal positions (stomach and spleen on the left, liver on the right), the 3-lobed right lung is on the right, and the 2-lobed left lung on the left;the right atrium is on the right, and the left atrium is on the left.
What is situs inversus?
The mirror image of situs solitus, in which there is a reversal of placement of the abdominal and thoracic structures resulting in a left-sided liver, right-sided stomach, left-sided IVC, right atria on the left side, and the left atria on the right side. With this arrangement, concordance among organs, vessels, and cardiac components is generally conserved.
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