Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are within normal limits . The lungs are clear without focal consolidation , pleural effusion or pneumothorax . Of note , there is sclerosis and heterogeneity involving the left humeral head with a somewhat altered contour .
    OUTPUT:
    
No acute cardiopulmonary process . Sclerosis and heterogeneous appearance of the left humeral head , incompletely characterized .