left lower lobe pneumoniaР2.case2: multiple(diffuse); small(military) nodules throughout both lungs; homogeneous density; impression: military tuberculosisР3.case3: multiple nodules; bilateral lung fields; well-defined margins; homogeneous density; impression: pulmonary metastasesР4.case4: anterior mediastinum(anterior to the great vessels); mass; well-defined margins; soft tissue density; homogeneous density; impresson: thymomaР5.case5: right hilum enlarged; the wall of the bronchus thickened; soft tissue density mass; mediastinal and right pulmonary artery involvement; obviously and heterogeneously enhancement; paratracheal and subcarinal lymph nodes enlarged; impression: right central bronchial carcinoma involved mediastinal and right pulmonary artery, mediastinal lymph nodes metastases