Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A catheter is been withdrawn from the left chest cavity in the area is interval accumulation of a small left pleural effusion . There is additional streaky density in the lower left lung consistent with subsegmental atelectasis as before . The right lung remains clear . The cardiac silhouette is prominent . Mediastinal structures are stable in appearance . The bony thorax is grossly intact .
    OUTPUT:
    
On accumulation of small left effusion post removal of chest tube . Persistent left subsegmental atelectasis .