What does CT diagnosis mean that the dorsal segment of the right lower lobe contains air sac?

The main points of diagnosis of central lung cancer are to find nodules or masses in bronchial cavity, thickening, stenosis or complete occlusion of bronchial wall, hilar masses and obstructive pneumonia and atelectasis. The main point of diagnosis of peripheral lung cancer is to find nodules or masses in peripheral lung tissue. Those whose diameter is less than 3CM often have cavity sign, bronchial inflation sign, lobulation sign, burr sign and pleural depression sign. Lung cancer has a certain possibility.