Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low . Mild enlargement of the cardiac silhouette with a left ventricular predominance is re - demonstrated . Widening of the superior mediastinum is attributable to mediastinal lipomatosis , and is unchanged . A moderate left pleural effusion is partially loculated laterally , and there is a continued rounded opacity within the left upper - mid lung field measuring up to 3 .8 cm , likely reflective of rounded atelectasis as a similar appearance was noted on the previous chest CT . No pulmonary edema is present , and there is no pneumothorax . There is no right - sided pleural effusion . Left basilar opacity likely reflects compressive atelectasis though infection can not be excluded in the correct clinical setting . Marked degenerative change of the imaged thoracic spine is present with loss of height of multiple vertebral bodies as seen previously .
    OUTPUT:
    
1 . Moderate left pleural effusion , partially loculated laterally , with adjacent left upper - mid lung field rounded opacity similar to that seen on the prior chest CT and felt to reflect rounded atelectasis . 2 . Left basilar opacity is most likely reflective of compressive atelectasis though infection is not excluded in the correct clinical setting .