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Case Reports
, 18 (6), 631-4

A Curious Isolated Cystic Lesion of the Membranous Atrioventricular Septum

Case Reports

A Curious Isolated Cystic Lesion of the Membranous Atrioventricular Septum

Christina M Phelps et al. Cardiol Young.


We present the case of an isolated cystic lesion of the atrioventricular component of the membranous septum of unclear aetiology, but responsible for cardiomegaly and benign disturbances of cardiac rhythm. As far as we are aware, this type of lesion has not previously been documented.


Figure 1
Figure 1. Imaging studies
(a) Four chambered view of the heart tipped posterior showing the large mass arising from the left ventricle. (b) Colour Doppler showing flow within the mass. (c) Cardiac magnetic resonance imaging revealing the size of the mass and (d) its connection to the left ventricle.
Figure 2
Figure 2. Intracardiac mass
(a) Pulsatile mass visualized externally in the inferior atrioventricular groove at the junction of the inferior caval vein with the right atrium. (b) View through the right atrium revealing whitish, fibrotic mass jutting up into the inferior portion of the right atrium. (c) The opened mass with the neck connecting to the left ventricle. (d) A haematoxylin and eosin stained tissue section demonstrating cyst wall lined by squamous epithelium with underlying granulation tissue.

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