Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle patchy opacity projecting over the right upper lung could be due to overlap of vascular structures , but infection may be present . The left lung is clear . There is no pleural effusion or pneumothorax . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Subtle right upper lung patchy opacities nonspecific , could represent overlap of vascular structures however focus of infection may be present . Findings could be further evaluated with shallow oblique radiographs .