In this abnormality both atriums are connected to the Left Ventricle. Usually there is a small (hypoplastic) right ventricle (RV), which may be on the opposite side of the heart to the usual (as in " Corrected Transposition"). The arteries usually arise with the aorta from the RV and the pulmonary artery from the LV (Transposition).

Other cardiac defects are often present (e.g. Pulmonary Stenosis or Atresia; Coarctation of the aorta).

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