Figure legends :
Figure 1 : The trans-oesophageal mid-oesophageal four -chamber echocardiography showing a thick-walled multi-septate honeycombed cyst (6.9cm Χ 5.6 cm) ,completely occupying interventricular septum (RV : right ventricle, LV: left ventricle , IVS: inter ventricular septum )
Figure 2 : The trans-oesophageal echocardiography showing the intra-cardiac structural involvement with the cyst : mid-oesophageal four chamber view showing septal tricuspid leaflet adherent to the cyst (A); the mid-oesophageal aortic valve long-axis view showing the protrusion of the cyst into the left ventricle outflow tract without any turbulence on colour doppler(B)(RA: right atria, RV: right ventricle, LA: left atria, LV: left ventricle, IVS : inter-ventricular septum, ATL : anterior tricuspid leaflet , STL: septal tricuspid leaflet, AoV: aortic valve , LVOT: left ventricle outflow tract )
Figure 3 : The trans-oesophageal mid-oesophageal right ventricle focussed view showed no tricuspid regurgitation on colour doppler suggestive of insignificant leaflet adhesion to cyst membrane(RA: right atria, RV: right ventricle, LA : left atria, IVS: inter ventricular septum )
Figure 4 : The trans-oesophageal right ventricle focused view acquired after cyst excision showed an intact interventricular septum and no tricuspid regurgitation (RA: right atria, RV: right ventricle, LA: left atria , IVS: interventricular septum, TR: tricuspid regurgitation )