Congenital cystic tumors of the atrio-ventricular node: successful demonstration by an abbreviated dissection of the conduction system.

Pathologists are dissuaded from the pathological study of the conduction system by the high cost and complexity of a traditional complete study. However, a simplified, low-cost approach can produce concrete information when performed in carefully selected cases of atrioventricular block, as demonstrated in the two cases of congenital cystic tumor of the atrioventricular node described in this report.