The Yale Thoracic Pathology Service specializes in analysis of tissue obtained from the thorax, including lungs, trachea, and chest wall, for evaluation for neoplastic (e.g. lung cancer, mesothelioma, other tumors) conditions as well as specific non-neoplastic conditions (inflammatory lung disease, including specific infections and fibrotic (scarring) diseases of the lung). The Service includes evaluation of prognostic features relative to tumor immunotherapy (PD-L1 expression levels).