Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph demonstrates a right PICC terminating in the right upper atrium . Heart size is normal and the lungs are fairly well - aerated . Opacity in the lateral left lower lung may represent atelectasis , but infection can not be excluded in the right clinical setting . There is no pneumothorax . The left costophrenic angle is not imaged , but within these limitations there is no pleural effusion .
    OUTPUT:
    
Opacity projecting over the left lung base may represent atelectasis , but infection can not be excluded in the right clinical setting .