congenital abnormalities in which the heart is in the normal position (levocardia) in the left side of the chest but some or all of the thorax or abdomen viscera are transposed laterally (situs inversus). It is also known as situs inversus with levocardia, or isolated levocardia. This condition is often associated with severe heart defects and splenic abnormalities such as asplenia or polysplenia.