Abstract
Klippel-Trenaunay-Weber syndrome (KTWS) is a rare congenital disorder characterized by cutaneous capillary malformations, bone hypertrophy, and multiple venous or lymphatic malformations. KTWS is associated with chronic thromboembolic pulmonary hypertension (CTEPH), presumably due to thromboembolism from multiple vascular malformations. Here, we report the first case series of patients with KTWS-CTEPH who underwent balloon pulmonary angioplasty (BPA). Both patients are alive 20 years and 1 year after the initial diagnosis of CTEPH, respectively, and are stable with improved hemodynamics. BPA may be an effective treatment option for patients with KTWS-CTEPH.