Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild linear atelectasis is seen at the left lung base . The lungs are otherwise grossly clear without lobar consolidation , pleural effusion , pneumothorax , or pulmonary edema . Mild cardiomegaly is unchanged . No free air seen beneath the diaphragm .
    OUTPUT:
    
Mild , stable cardiomegaly without acute cardiopulmonary process .