Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present which cause crowding of the bronchovascular structures . There is no pulmonary edema . There has been interval removal of the right - sided PIC line . There is mild cardiomegaly . There is a tracheostomy tube , with an overlying rebreather mask limiting assessment of the upper lungs . There is mild right basilar atelectasis . There is a patchy opacity in the left lung base , which could be secondary to atelectasis , however pneumonia can not be ruled out . There is no evidence of pneumothorax . A small left pleural effusion is likely present .
    OUTPUT:
    
Patchy opacity in the left lower lung could be secondary to atelectasis , however pneumonia can not be excluded . Small left pleural effusion .