To the editor:We would like to correspond about and share ideas related to the publication “Surgical outcomes of cor triatriatum sinister: a single-center experience” [1]. According to Kim et al. [1], surgical correction of cor triatriatum can be done safely and successfully with a very low risk of recurrence. We agree that surgery is required to treat cor triatriatum. If an experienced surgical team follows a good surgical strategy, the outcome will be positive. The observation by Kim et al. [1] confirms the previous report by Fuchs et al. [2]. A longer observation period might be needed to draw conclusions regarding recurrence. In addition to recurrence, the occurrence of pulmonary vein stenosis is another interesting finding that warrants long-term follow-up. According to a previous report, this condition might occur after surgical manipulation of cor triatriatum [3]. Finally, an early diagnosis and correction, as described in the report by Kim et al. [1], might lead to favorable management outcomes. If the diagnosis and surgical management occur too late and the patient has severe clinical problems, fatal outcomes after surgical management are still reported [4].