The Yield of Endobronchial Biopsy in Pulmonary Sarcoidosis: Connection between Spirometric Impairment and Lymphocyte Subpopulations in Bronchoalveolar Lavage Fluid

Background: Sarcoidosis is a multi-organ granulomatous disorder of undetermined aetiology with 90% of patients exhibiting some degree of pulmonary involvement. Transbronchial biopsy