Krabill and Lucas reported a classification of cor triatriatum.
Patient selection: accessory atrial chamber (third atrium, tri-atrium)
(1) number of pulmonary veins entering into accessory atrial chamber
(2) connection of accessory atrial chamber with left atrium
(3) other connections (normal or anomalous)
Pulmonary Veins Connected to Accessory Atrial Chamber
Accessory Atrium Connects with Left Atrium
anomalous to right atrium
some pulmonary venous return enters superior or inferior vena cava
1 to 3
other pulmonary veins connect to left atrium
other pulmonary veins connect to superior or inferior vena cava
anomalous to right atrium; some pulmonary venous return enters superior vena cava
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