Subvalvar aortic stenosis (SAS), also called subaortic stenosis, is a fixed form of anatomic obstruction to egress of blood across the left ventricular outflow tract (LVOT). (medscape.com)
We describe a rare case of an asymptomatic 20-year-old woman with mesocardia, CCTGA, and severe subvalvular pulmonic stenosis due to a ball-shaped accessory tissue in left ventricular outflow tract. (bvsalud.org)
Membrane3
The 4 basic anatomic variants are as follows: (1) a thin discrete membrane consisting of endocardial fold and fibrous tissue, (2) a fibromuscular ridge consisting of a thickened membrane with a muscular base at the crest of the interventricular septum, (3) a diffuse, fibromuscular, tunnel-like narrowing of the LVOT,[3, 4] and (4) accessory or anomalous mitral valve tissue. (medscape.com)
Abnormalities of the aortic and mitral valves frequently develop during the natural course of subvalvar aortic stenosis (SAS) because of tethering by encroaching fibroelastic tissue of the membrane and fibromuscular ridge. (medscape.com)
We report a case of surgically resected isolated subpulmonic fibrous ring in a lady with mirror-image dextrocardia and abdominal situs solitus that was misdiagnosed by echocardiography as a subaortic membrane. (bvsalud.org)