Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal AP upright portable chest radiograph was provided . The heart is moderately enlarged . Curvilinear calcification projecting over the heart likely represents mitral annular calcification . The aorta is somewhat unfolded . The lungs appear clear . Subtle opacity projecting over the right mid lung at the site of rib overlap likely reflects summation of shadows . No free air is seen below the right hemidiaphragm . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Cardiomegaly with evidence of mitral annular calcification . Subtle nodularity in the right mid lung likely reflects summation of shadows though oblique projections may be obtained to clarify . No free air below the right hemidiaphragm .