26 cases ( 72.2%) had abnormal chest radiographic films, which included increased and/ or disordered lung marking, densed hilar shadows, butterfly shadows, spot and cloud shadows in lung fields, obscure or obliteration of the costophrenic angle. 26例(72.2%)胸片异常,表现为肺纹理增多紊乱、肺门阴影增浓、以肺门为中心向外扩散的蝶形阴影、肺部片状模糊阴影、肋膈角模糊或消失。