Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Evaluation is limited due to low lung volumes and suboptimal penetration on the lateral view . Additionally , the patient 's chin obscures the superior mediastinum and left lung apex on the frontal projection . Allowing for these limitations , there is mild left basal atelectasis . No convincing signs of edema or pneumonia . Heart size and mediastinal contour suboptimally assessed given technical limitations . No osseous abnormalities are detected . No large effusion or pneumothorax .
    OUTPUT:
    
Limited exam with mild left basal atelectasis . No overt signs of edema or pneumonia .