<unk>  (also known as lung mass) is generally defined as any area of pulmonary opacification that measures more than 30 mm in the lung.<unk>  can be benign or malignant. On the other hand, pulmonary nodule is defined as a relatively well defined round or oval pulmonary parenchymal lesion equal or smaller than 30 mm in diameter. Pulmonary nodule can be classified into 2 categories: solitary or multiple.
Pulmonary mass
Lung mass
Pulmonary nodule
Pulmonary consolidation
Multiple pulmonary nodules
Mediastinal mass
Trapped lung
Mediastinal tumor