Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . A left thoracostomy tube remains unchanged in position . A small left pleural effusion appears slightly worsened , with adjacent left basilar atelectasis difficult to differentiate from consolidation . Background pulmonary parenchymal opacities remains stable . There is no pneumothorax .
    OUTPUT:
    
Slight worsening of small left pleural effusion with increased atelectasis at the left base , difficult to differentiate from evolving consolidation . No pneumothorax .