Asymptomatic congenital anomaly of the heart: Congenital muscular cord bridging walls of auricle above center of mitral valve

Electrophysiological characteristics of a left atrial anomalous muscular band in a case with paroxysmal atrial fibrillation

“…The sizes ranged from 1.5 to 4 mm in width, from 0.5 to 2 mm in thickness, and from 4 to 55 mm in length 1 . Histopatholgical studies showed that the anomalous bands were composed of fibrous and muscular tissue with no Purkinje cells,1, 3 which is consistent with working cardiac muscle. The embryological origin of the LA anomalous band is unclear but is thought to be the result of an elongation of abnormal adhesions between the outer wall of the atrium and the part of the atrial septum formed by the endocardial cushions, 2 or a remnant of a part of the right valve of the sinus venosus, which enters into the left atrium through the foramen ovale 1 …”

Anomalous Chord of the Left Atrium without Involvement of the Mitral Valve

“…To our knowledge, this is the first reported case of an echocardiographic diagnosis of anomalous chord crossing the left atrium without association with the mitral valve. McNamara et al 3 describe a similar anomaly during routine autopsy of the heart of an adult patient who died of noncardiac pathology. They noted a smooth round chord extending across the LA, from atrial septum to the free wall of the LA.…”

Aberrantly inserted chordae tendineae without significant mitral regurgitation

“…Aberrantly inserted chordae tendineae in the left atrial side are a rare find. Less than 30 cases have been reported since 1947, with and without mitral valve involvement . An anomalous chord of the left atrium could be considered within normal human anatomic variation .…”

“…Less than 30 cases have been reported since 1947, with and without mitral valve involvement. [1][2][3][4] An anomalous chord of the left atrium could be considered within normal human anatomic variation. 5 However, this young patient with aberrantly inserted chordae tendineae and without significant mitral regurgitation should be closely monitored, because mitral regurgitation could suddenly become significant.…”