Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Allowing for under penetrated technique , the lungs appear clear . Multiple There is a convex density projecting over the left upper lung , not clearly seen on prior exam which appears to reside anteriorly on the lateral projection for which CT is recommended to further assess . Aside from this , no abnormalities within the lungs . Cardiomediastinal silhouette stable . Left humeral head replacement noted . chronic appearing left rib deformities are seen . No acute bony abnormalities .
    OUTPUT:
    
Density projecting over the left upper lung anteriorly for which nonemergent CT is recommended to further assess .