Abstract： @@ To the Editor : I read with interest the case report by Shen et al1 of transcatheter treatment of Lutembacher syndrome. Lutembacher syndrome refers to a congenital atrial septal defect (ASD) complicated by acquired mitral stenosis (MS).2 The incidence of MS in patients with ASD is 4%, the incidence of ASD in patients with MS is 0.6%-0.7%.2 Lutembacher syndrome in the past has been overdiagnosed or misdiagnosed because of the presence of a mid-diastolic murmur in patients with ASD, until it was realized that the mid-diastolic murmur was due to excessive flow through the tricuspid valve from the left-to-right interatrial shunt.