Tetralogy of Fallot associated with atrioventricular (AV) canal is a well-recognized cardiac malformation; its surgical repair carries a high mortality, which is related partly to the complexity of the defect and partly to incomplete diagnosis. Hence an accurate preoperative diagnosis is essential. This communication describes the angiographic features observed in 17 patients with tetralogy of Fallot and AV canal with emphasis on the morphology of the right AV valve as seen during the right ventriculogram. A complete anatomic diagnosis can be consistently made from right and left ventriculograms performed in axial projections.
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