Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is mildly enlarged , unchanged . Mediastinal and hilar contours are unremarkable . There is crowding of bronchovascular structures without overt pulmonary edema . Patchy opacities in the lung bases likely reflect areas of atelectasis , though infection is not completely excluded . There is no pleural effusion , focal consolidation or pneumothorax identified . Prominent right nipple shadow is noted .
    OUTPUT:
    
Low lung volumes with patchy opacities in the lung bases most likely reflective of atelectasis . Infection , particularly atypical pneumonia however , is not completely excluded in the correct clinical setting .