“…6,7) Case reports of PHG have described associations with prior tuberculosis, histoplasmosis and pulmonary fungal infections. 1,2,6) Patients with PHG have been found to have a number of autoimmune abnormalities, including antinuclear antibodies, rheumatoid factor, and antismooth-muscle, anti-microsomal and anti-thyroglobulin antibodies. Case reports have described associations with autoimmune conditions such as rheumatoid arthritis, multiple sclerosis, uveitis, Castleman's disease, sclerosing mediastinitis and retroperitoneal fibrosis.…”