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Seventy-six cardiac autopsy specimens with ventricular septal defects were studied from a surgical viewpoint. The defects were classified as being conoventricular (n = 25), in the right ventricular outlet (n = 21), in the inlet septum (n = 11) or in the trabecular septum (n = 19) with each category having several subcategories. The left ventricular outflow tract relations of the defects are emphasized. The borders of the ventricular septal defects are described in detail, with use of the prefix "juxta" to indicate the immediate adjacency of the defect to a structure such as the tricuspid valve.

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