Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Examination limited secondary to body habitus . AP upright and lateral chest radiograph demonstrate a linear opacity within the right upper lobe , better characterized on CT chest dated ___ . Moderate enlargement of the cardiac silhouette is stable . Mediastinal and hilar contours are similar in appearance to prior examination with enlargement of bilateral hila to suggest pulmonary arterial hypertension . There is no large pleural effusion . There is no pneumothorax .
    OUTPUT:
    
No acute intrathoracic abnormality .