Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval new volume loss in the left chest , shift of mediastinal structures to the left , left basilar consolidation , predominantly from atelectasis . There may be small component of left pleural effusion . Left perihilar opacity , atelectasis versus infiltrate . There is abrupt cut off of distal left mainstem bronchus , decreased arborization of the left bronchial tree , possibly for mucous plugging . Right Port - A - Cath in place . Surgical instrumentation in the thoracic spine . Right lung is clear . Degenerative arthritis right shoulder . No pneumothorax .
    OUTPUT:
    
Left lung volume loss , predominantly from atelectasis . Component of left perihilar infiltrate can not be excluded . There may be small left pleural effusion . Suggestion of mucous plugging left lung .