Case histories and clinico-roentgenologic symptoms of 103 children with intrathoracic lymphatic tuberculosis and 66 with non specific intrathoracic adenopathies were analysed. As a result, considerable differences were revealed both in the natural history of intrathoracic adenopathies of tuberculous and nonspecific etiology and in the clinical symptoms and X-ray picture, making it possible to ascertain a nosologic diagnosis of the disease. A diagnosis-rating table for the most common diseases with underlying hyperplasia of the intrathoracic lymph nodes has been developed.