Edson Marchiori1, Diana Penha2, Gláucia Zanetti3. 1. Department of Radiology, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil. Electronic address: edmarchiori@gmail.com. 2. Department of Radiology, Liverpool Heart and Chest Hospital NHS Foundation Trust, Liverpool, UK. 3. Department of Radiology, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.