Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrates no focal opacity convincing for pneumonia . Heart size is upper limits of normal with prominent central vasculature . There is no overt pulmonary edema . There is no appreciable pleural effusion . No pneumothorax . There is no air under the right hemidiaphragm .
    OUTPUT:
    
Heart is upper limits of normal in size . No focal opacity convincing for pneumonia .