title: A prevalence study of IgG4-related ophthalmic disease in Japan.
abstract: OBJECTIVE
  Immunoglobulin (Ig)G4-related ophthalmic disease belongs to a category of ocular adnexal lymphoproliferative disorders, the most frequent group of orbital tumors and simulating lesions. The aim of this study was to elucidate the number of IgG4-related diseases of orbital lymphoproliferative disorders and correlate ages and sex of such patients from 18 centers in Japan.
  
  
  METHODS
  One thousand and fourteen patients with orbital lymphoproliferative disorders were enrolled in this study. All had pathologically diagnosed lymphoproliferative disorders with surgical samples of ocular adnexal tissue. Patients with conjunctival lesions and intraocular lymphoma were excluded.
  
  
  RESULTS
  Of the 1,014 cases of orbital lymphoproliferative disorders 404 (39.8 %) had extranodal mucosa-associated lymphoid tissue (MALT) lymphoma, 156 (15.4 %) had other malignant lymphomas, 191 (18.8 %) had non-IgG4 orbital inflammation, 219 (21.6 %) had IgG4-related orbital inflammation, and 44 (4.3 %) had IgG4-positive MALT lymphoma. Median age of the IgG4-related orbital inflammation group was 62 years, which is significantly lower than that of the MALT lymphoma group (median 66 years) and higher than the non-IgG4 orbital inflammation group (median 57 years). The male/female ratio was 105/114 in the IgG4-related orbital inflammation group.
  
  
  CONCLUSIONS
  Nearly a quarter of orbital lymphoproliferative disorders in Japan are related to IgG4.
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D007074:Immunoglobulin G / Q000276:immunology*; D007564:Japan / Q000453:epidemiology; D018442:Lymphoma, B-Cell, Marginal Zone / Q000453:epidemiology; D008224:Lymphoma, Follicular / Q000453:epidemiology; D016403:Lymphoma, Large B-Cell, Diffuse / Q000453:epidemiology; D008232:Lymphoproliferative Disorders / Q000453:epidemiology* / Q000276:immunology / Q000473:pathology; D008297:Male; D008875:Middle Aged; D016727:Orbital Pseudotumor / Q000453:epidemiology* / Q000276:immunology / Q000473:pathology; D015995:Prevalence; D012189:Retrospective Studies; D017678:Sex Distribution; D055815:Young Adult
chemical_list: D007074:Immunoglobulin G
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