Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi upright AP view of the chest provided . Lung volumes are low limiting assessment . The lungs appear clear without focal consolidation , large effusion or pneumothorax . The cardiomediastinal silhouette appears normal . No rib fractures are identified . However , there is anterior and inferior dislocation of the left humeral head at the glenoid fossa , partially imaged along the edge of the film .
    OUTPUT:
    
1 . No acute intrathoracic process . 2 . Left shoulder dislocation . Dedicated left shoulder radiographs postreduction advised .