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- Etiology: spectrum of ostium primum atrial septal defect, cleft mitral leaflet, inlet ventricular septal defect, common AV valve, complete endocardial cushion defect
- CXR: Shunt vascularity, cardiomegaly, gooseneck deformity = elongation of left ventricular outflow tract on angiogram
- Clinical: 30% of AV canal seen in Down syndrome, 30% of Down syndrome have AV canal
Cases of AV Canal
CXR AP and lateral shows hyperexpanded lungs, increased pulmonary vascularity and marked cardiomegaly.
