Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval development of a large left pleural effusion with associated compressive atelectasis which shifts the cardiac silhouette to the right and shifts the left hemidiaphragm downward . Cardiac silhouette can not be accurately gauged due to obliteration of the left cardiac border by the large effusion . The right lung is clear . There is no pneumothorax . No distracted bony injury is identified .
    OUTPUT:
    
Interval development of a large left pleural effusion . If there is history of recent trauma , hemothorax should be considered . Other causes include infection or malignancy and malignancy , but the latter is less likely given the short interval time of development . Results were discussed over the telephone with Dr . ___ by ___ ___ at 9 : 40 on ___ at time of initial review .