[1] IAO Colli Monaldi Hosp, Dept Radiol, Via L Bianchi, I-80131 Naples, Italy
[2] Univ Naples 2, Sect Radiol & Radiotherapy, Dept Clin & Expt Med F Magrassi, Lanzara Piazza Miraglia 2, I-80138 Naples, Italy
[3] Univ Naples 2, Dept Pneumol & Oncol, UOC Clin Pulmonol, Via L Bianchi, I-80138 Naples, Italy