Inverted Malformations in Corrected Transposition of the Great Vessels

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Abstract
Inverted malformations are defined as those malformations that are specific for certain anatomic structures in the heart and that occur in corrected transpostion. An inverted malformation appears on the contralateral side of the heart from that characteristic for the basic malformation when present in the normally oriented heart. Two cases of corrected transposition with inverted malformations are presented. One was an example of an anomlous muscle mass occurring in the arterial ventricle of a heart with a special form of corrected transposition. This mass is considered to be an inverted form of anomalous muscle bundle of the right ventricle. The second case of corrected transposition was associated with a parachute deformity of the right atrioventricular valve, membranous sub-pulmonary stenosis, and bicuspid pulmonary valve. These malformations are considered to represent the inverted form of the developmental complex in which a parachute deformity of the mitral valve and subaortic stenosis are part.