cor triatriatum

(redirected from accessory atrium)

cor tri·at·ri·a·'tum

a heart with three atrial chambers, the left atrium being subdivided by a transverse septum with a single small opening that separates the openings of the pulmonary veins from the mitral valve.
Synonym(s): accessory atrium

cor tri·at·ri·a·tum

(kōr trī-at-rī-ā'tŭm)
A congenital anomaly characterized by a heart with three atrial chambers, the left atrium being subdivided by a transverse septum with a single small opening that separates the openings of the pulmonary veins from the mitral valve.