Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . There is the ill - defined opacity in the right upper lobe which is somewhat different appearance compared with prior chest radiograph suggesting resolution of previously noted right upper lobe pneumonia . There is apparent collapse of the posterior segment of the right upper lobe on the lateral projection . The left lung is clear . No effusion or pneumothorax . Cardiomediastinal silhouette appears stable . Bony structures are intact .
    OUTPUT:
    
Right upper lobe opacity , slightly different in appearance from prior radiograph of the chest with collapse of the posterior segment of the right upper lobe . Given patient 's history of malignancy , a CT may be performed to further assess if needed .