Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal consolidation . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are stable . Chronic right shoulder dislocation is re - demonstrated . Sclerosis along the superior aspect of the left humeral head is seen , more prominent than on the prior study , underlying avascular necrosis not excluded .
    OUTPUT:
    
No acute cardiopulmonary process . Chronic right shoulder dislocation . Increased sclerosis at the superior aspect of the left humeral head , avascular necrosis not excluded .