Digenic Inheritance in a Case of Pulmonary Arterial Hypertension Associated with Two Incidental Septal Defects and Multiple Thoracic Collaterals Alejandro Cruz-Utrilla, María Pilar Escribano Subias, Jair Antonio Tenorio Castaño, María Jesús del Cerro Marín

Vitamin D and Pulmonary Arterial Hypertension Francisco Perez-Vizcaino, Joan Albert Barberá, Diego A. Rodríguez Chiaradía

Arterial Tortuosity Syndrome: A Rare Cause of Pulmonary Hypertension Albert Riudor Guri, Raquel Luna López, Isabel Blanco