The constellation of the decreased left lower lobe lung volume, rounded soft tissue density adjacent to a pleural surface with associated pleural disease (pleural thickening, bilateral pleural effusions and bilateral calcific pleural plaques) and comet tail appearance of the pulled related bronchovascular bundles are diagnostic of round atelectasis.

Core biopsy was done from the lesion with the microscopic picture showing fibrosis, chronic inflammatory reaction and no malignant cells.