Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable single AP chest radiograph was obtained with patient in upright position . There has been interval removal of the right chest tube with development of a small right apical pneumothorax . There is no mediastinal shift . At the left lung base opacity is unchanged , likely related to atelectasis . No pleural effusion or pulmonary edema is seen . Cardiomediastinal contour is within normal limits .
    OUTPUT:
    
Small right apical pneumothorax without mediastinal shift . Findings were communicated with ___ by Dr .___ ___ telephone at time of discovery at 15 :56 on ___ .