Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is trace left apical pneumothorax . Pleural effusion is minimal , if any . There is left lower lobe volume loss . There is no pulmonary edema . Mildly enlarged cardiac silhouette is unchanged . The chest tubes and mediastinal drain are in unchanged position . Left PICC terminates in low SVC . Right internal jugular vein introducer has been removed . Sternotomy wires are intact .
    OUTPUT:
    
Trace left apical pneumothorax .