Mitral Valve Atresia is a congenital heart defect where the mitral valve does not form properly, leading to a blockage between the left atrium and left ventricle. This condition prevents normal blood flow from the lungs to the heart, causing the heart to work harder to pump blood. As a result, the heart may develop other complications, such as enlargement or heart failure. Treatment often involves surgical procedures to improve blood flow and may include the creation of a new pathway for blood to reach the left ventricle. Early diagnosis and intervention are crucial for better outcomes.