OBJECTIVETo explore the radiological features of cryptogenic organizing pneumonia (COP).

METHODSFive patients with COP were pathologically identified. The chest CT scanning was performed in all patients. The radiological features of COP were classified into four types according to pulmonary consolidation, ground grass opacity (GGO), nodule, and liner or reticular lesion. The distribution of lesions were classified according to the single or double lung fields, upper or lower lung field, or the surrounding bronchovascular bundle or subpleural area. The radiological types and distributions of the lesions were analyzed.

RESULTSAmong these 5 patients, pulmonary consolidation was found in 4 patients, ground grass opacity in 3 patients, nodules in 2 patients, and reticulation in one patient. Various radiological features were also observed at the same time. The pulmonary consolidation was distributed along the bronchovascular bundle or subpleural area. The distribution of GGO and pulmonary nodules were nonspecific.

CONCLUSIONSThe most common radiological features of COP were pulmonary consolidation and GGO. The distribution of pulmonary consolidation is specific. It extends along the bronchovascular bundle or located in the subpleural area.