title: Pyothorax-associated lymphoma.
abstract: In Japan, EBV positive rate in immunocompetent patients with nodal lymphomas is less than 10% in B-cell and 20-50% in T cell lymphoma. Among extranodal lymphomas, EBV positive rate is higher in pyothorax-associated lymphoma (PAL), nasal NK/T-cell lymphoma, and adrenal lymphoma. PAL is non-Hodgkin's lymphoma that develops from chronic pyothorax resulted from artificial pneumothorax for the treatment of lung tuberculosis or tuberculous pleuritis. This disease was originally described by Dr. Aozasa as a distinctive clinicopathologic entity in 1987, and now listed as the disease entity in the WHO classification of Tumours, Pathology & Genetics, Tumours of the Lung, Pleura, Thymus and Heart (2004).
authors.affiliation: Department of Pathology (C3), Osaka University Graduate School of Medicine, Osaka, Japan.
authors.forename: Katsuyuki
authors.initials: K
authors.lastname: Aozasa
mesh_terms: D016724:Empyema, Pleural / Q000150:complications* / Q000453:epidemiology / Q000266:history / Q000473:pathology; D049673:History, 20th Century; D049674:History, 21st Century; D006801:Humans; D007564:Japan; D016393:Lymphoma, B-Cell / Q000453:epidemiology / Q000209:etiology* / Q000266:history / Q000473:pathology; D016399:Lymphoma, T-Cell / Q000453:epidemiology / Q000209:etiology* / Q000266:history / Q000473:pathology; D009669:Nose Neoplasms / Q000453:epidemiology / Q000209:etiology* / Q000266:history / Q000473:pathology; D010997:Pleural Neoplasms / Q000453:epidemiology / Q000209:etiology* / Q000266:history / Q000473:pathology; D011030:Pneumothorax / Q000150:complications / Q000453:epidemiology / Q000266:history / Q000473:pathology; D014396:Tuberculosis, Pleural / Q000150:complications / Q000453:epidemiology / Q000266:history / Q000473:pathology