PMC6703990_01
Intraoperative transoesophageal echocardiography of a subvalvular membrane in the left ventricular outflow tract (marked by an arrow), measuring 1.0 x 0.5 cm, with probable connection to the anterior mitral valve leaflet.
10-1055-s-0039-1693451-i190331crc-1.jpg
PMC6703990_01_10-1055-s-0039-1693451-i190331crc-1.jpg
FI190331crc-1
The patient was admitted for surgical valve replacement and deobstruction of the left ventricular outflow tract (LVOT) (PPG of 35 mm HG, MPG of 19 mm Hg) ( Fig. 1 ).  Transesophageal echocardiography confirmed a subvalvular membrane in the LVOT, measuring 1.0 x 0.5 cm, with probable connection to the anterior mitral leaflet ( Fig. 1 ).
Excision of the subvalvular membrane through the left atrium (filmed by videoscopy).
10-1055-s-0039-1693451-i190331crc-2.jpg
PMC6703990_01_10-1055-s-0039-1693451-i190331crc-2.jpg
FI190331crc-2
MV and the subvalvular membrane ( Fig. 2 ). MV leaflets showed severe endocardial thickening.