Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Slightly low lung volumes contribute to exaggeration of the cardiac size as well contribute to subsegmental atelectasis and increased pulmonary markings . No focal opacities are present that are concerning for pneumonia . The aorta is tortuous . No pleural effusion or pulmonary edema . Probable background hyperinflations / COPD .
    OUTPUT:
    
Given low lung volumes , no evidence of pneumonia . Probable mild cardiomegaly and possible mild vascular plethora .