The pathogenesis of atrial and atrioventricular septal defects with special emphasis on the role of the dorsal mesenchymal protrusion.
[cambridge.org]
septal defect of 3 cm.
[jcecho.org]
The ostium primum defect, which accounts for one-sixth of defects, is in reality an atrioventricular septal defect, but with shunting exclusively at atrial level.
[orpha.net]