Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subcutaneous emphysema is noted along the visualized portion of the lower left neck . There is a small focus of lucency at the extreme upper apex of the left lung . This could be due to some overlying subcutaneous emphysema . A tiny left apical pneumothorax is considered less likely , but is not entirely excluded . In addition , there is equivocal minimal air to the left of the trachea , adjacent the left lung apex --___ real , this could represent a very small amount of pneumomediastinum . Elsewhere , no evidence of pneumomediastinum , pneumopericardium , or pneumothorax . Heart size is at the upper limits of normal . The cardiomediastinal silhouette is otherwise within normal limits . No CHF , focal infiltrate , or effusion detected .
    OUTPUT:
    
Subcutaneous emphysema over the lower left neck and question over the left lung apex . A tiny left apical pneumothorax is in the differential for the latter finding , but is considered less likely . No other evidence of pneumothorax . Equivocal minimal lucency to the left of the trachea could lie within the mediastinum or could represent overlying subcutaneous emphysema . No other evidence of pneumomediastinum is detected . Otherwise no acute pulmonary process .