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影像资料（Image data） What are the main imaging points of lung cancer, cavitary cavity, tuberculous cavity and pulmonary abscess? Cancerous cavity refers to lung cancer center necrosis empty after formed bronchial after discharge, the gas-liquid plane wall is rare, often very irregular with mural nodule protruded cavity wall is relatively clear, empty wall thickness is uneven, without calcification, surrounding satellite nodules often see. The central lung cancer is caused by obstructive inflammation of the distal lung. The abscess may also become empty after emptying The lung abscess occurs in the lower lobe and the upper lobe, and is often associated with aspiration. The acute phase is a large area of pulmonary consolidation. There is a cavity in the background, the outer edge is obscure, the internal wall is regular, and there is often a larger gas-liquid plane. Combined with the clinical manifestation, it is difficult to distinguish from the cancerous cavity. Chronic abscess, inflammatory absorption machine, the outer wall is clear, granulation tissue growth, relatively regular finishing, but may be irregular, thick wall, the thickness is uniform, also are empty are gas-liquid plane, sometimes just from the morphological imaging examination and cancer hole identification, combined with the clinical course and imaging process will help to make a correct diagnosis.??? Tuberculous cavity has two kinds: one kind is composed of infiltrative pulmonary tuberculosis developed into pulmonary tuberculosis, a good hair in the upper lobe and dorsal segment of lower lobe, more multiple, acute period is thin and uniform in size, gas-liquid plane rare. Chronic period hole size, wall thickness, wall rules, can have small gas-liquid plane, often associated with lung fibrosis, above Ye Mingxian, lung texture in willow shaped, easy diagnosis. The other one is tuberculoma cavity formation, occurs in the upper lobe and dorsal segment of lower lobe, irregular thick wall cavities, HRCT oft