Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle ___ mm opacity projects over the lateral right upper hemi thorax above the level of the posterior lateral right sixth rib of unclear etiology ; finding may be external to the patient . Recommend shallow oblique radiographs for further assessment . The left lung is clear . There is no pleural effusion or pneumothorax . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Subtle 8 mm opacity projecting over the lateral right upper hemi thorax , as above , of unclear etiology . Finding may be external to the patient but underlying pulmonary nodule is not excluded . Recommend further assessment with bilateral shallow obliques chest radiographs . The remainder of the lung fields are clear .