Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Crowding of bronchovascular markings at the right medial lung base noted limiting the evaluation for a subtle pneumonia at this site . Otherwise the lungs are clear . Heart size is normal and stable . Prominence of the mediastinum is again noted though the contours appear well defined . The stability of this appearance over multiple prior imaging studies suggests a benign etiology , i .e . mediastinal lipomatosis . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
No convincing evidence for pneumonia . Difficult to exclude an early pneumonia in the right medial lung base . Mild prominence of the mediastinum over multiple prior chest radiographs likely reflect prominent mediastinal fat .