Unusual pulmonary lesions – A series of rare cases

In thoracic imaging, mass means any pulmonary, pleural, or mediastinal lesion more than 3 cm in diameter (without regard to contour, border, or density characteristics). Nodule means rounded opacity, well or poorly defined, measuring up to 3 cm in diameter. We report 4 rare cases – presented as mass or nodular lesion in chest imaging.