Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a 3 .4 x 3 .0 cm rounded opacity within the right upper lobe posteriorly , which may represent a round pneumonia , but is concerning for malignancy . The lungs are otherwise clear . Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
3 .4 cm round mass within the right upper lobe posteriorly , which may represent a round pneumonia , but is concerning for malignancy .