Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate enlargement of the cardiac silhouette is again noted . The aortic contour remains tortuous with dilatation of the ascending aorta appearing unchanged . Lung volumes are low with crowding of bronchovascular structures and probable mild pulmonary vascular congestion is present . 12 mm nodular opacity projecting over the left lower lobe is better demonstrated on the previous chest CT . No focal consolidation , large pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
1 . Low lung volumes . Moderate cardiomegaly with possible mild pulmonary vascular congestion . 2 . 12 mm nodular opacity within the left lower lobe , better assessed on previous chest CT , and for which PET - CT is suggested for further assessment .