Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since ___ , the base of the aerated right lung has elevated , changed configuration obscuring much of the right heart border . Even thought the mediastinum is midline the findings are best explained by collapse of the right middle and lower lobes . A left retrocardiac opacity obscures the margin of the descending thoracic aorta and the medial diaphragmatic interface , most likely due to atelectasis of the basal segments of the left lower lobe . Bilateral small pleural effusions are possible . There is no pneumothorax . Cardiomediastinal and hilar structures are normal .
    OUTPUT:
    
Probable collapse of the right lung middle and lower lobes and probable basilar atelectasis of the left lung , new since ___ . Small bilateral pleural effusions are possible , but not clinically significant , that is , not responsible for the severe atelectasis .