Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP portable chest radiograph . There is no focal opacity convincing for pneumonia . Mild linear ccarring at the right lung base is noted . Heart appears mildly enlarged . No evidence of pulmonary edema . No evidence of pleural effusion . A left chest port is noted its tip terminating in the distal superior vena cava . Osseous structures appear intact .
    OUTPUT:
    
No pneumonia . Mild cardiomegaly .