Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate low lung volumes . There is no pleural effusion or focal consolidation . No pneumothorax . The left hemidiaphragm is obscured . No pulmonary edema . Partially imaged upper abdomen is unremarkable .
    OUTPUT:
    
Obscuration of the left hemidiaphragm likely due to retrocardiac opacities , which may reflect atelectasis , although superimposed infection may be considered in the appropriate clinical setting .