Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior study , the left chest tube is been removed . There is a new faint focal opacity at the left base laterally , measuring approximately 2 .7 cm in diameter which could reflect localized pleural fluid or pulmonary contusion . No gross effusion and no obvious pneumothorax is detected . Probable atelectasis at the left lung base . The left hemidiaphragm is elevated , similar to prior . Subcutaneous emphysema along the lower left chest wall is slightly increased . There is some residual atelectasis in the right mid zone , but upper zone atelectasis has cleared . Minimal atelectasis in the right cardiophrenic region . Minimal blunting of the right costophrenic angle but no gross effusion . Cardiomediastinal silhouette is unchanged . No CHF .
    OUTPUT:
    
Chest tube removed . Small focal opacity left lung base laterally probably related to the chest tube site . Otherwise , doubt significant interval change . No obvious pneumothorax or gross effusion .