Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes with bibasilar atelectasis . Small opacification at the left base , which is concerning for pneumonia , appreciated on both frontal and lateral radiographs . Moderate enlargement of the cardiac silhouette is new since ___ , with cardiomegaly and / or pericardial effusion . No pulmonary edema . No pleural effusion . No pneumothorax . Configuration of the mediastinum at the thoracic inlet with undulation of the trachea could be due to tortuous vessels alone or possible contribution of enlarged right thyroid lobe .
    OUTPUT:
    
Likely left lower lobe pneumonia . Suggest repeat chest radiograph electively to document clearing . The region may need to be clarified with chest CT . Note : Abdomen CT performed 3 hr after this examination confirmed enlargement of probable pneumonia , left lower lobe , alternatively very large pulmonary infarct . There is no pericardial effusion .