Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta is mildly unfolded . The hilar contours are normal . The pulmonary vasculature is normal . On the lateral view , a well - delineated triangular opacity is noted posteriorly along the right medial lung base , partially obscuring the right posterior hemidiaphragm . Lungs are otherwise clear . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Triangular opacity within the posterior aspect of the right medial lung for which further assessment with contrast - enhanced chest CT is recommended .