Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in semi-upright position . Analysis is performed in direct comparison with the next preceding similar study dated ___ . Already on the preceding study , marked increase of the heart size was noted in comparison with previous chest examinations , which date , almost one year ago . A chest CT of ___ , also described evidence of right and left upper lobe pulmonary malignancies that have been treated with CyberKnife radiation . Linear mostly atelectatic densities in this areas appear to be remnants of these interventions and explain the presence of fiducious mark in the territory of the left upper lobe lingula . The accessible pulmonary vasculature is not congested ; however , the heart is markedly enlarged . There is now a plate atelectasis in the left lower lobe in retrocardiac position , which explains the poor visibility of the diaphragmatic contour , but there is no evidence of pleural effusion in the lateral pleural sinuses . The thoracic aorta is generally widened and elongated and shows extensive wall calcifications at the level of the arch . There is , however , no local contour abnormality suspicious for aneurysm .
    OUTPUT:
    
Marked cardiac enlargement in the absence of significant pulmonary congestion . Consider possibility of pericardial effusion as the cause . Status post upper lobe scars in this patient with history of previous CyberKnife therapy . No evidence of pneumothorax or new acute pulmonary parenchymal infiltrates .