title: High incidence of orbital malignant lymphoma in Japanese patients.
abstract: OBJECTIVE
  To review 244 cases of orbital tumors to determine pathologic findings in Japanese patients.
  
  
  METHODS
  Observational case series.
  
  
  METHODS
  We studied the pathology and origin of tumors in the orbit in 244 consecutive Japanese patients with orbital tumors at our institution from 1981 through 2002 (age 0 to 90 years, mean, 48.7 years; 114 men, 130 women).
  
  
  RESULTS
  The most common tumors were lymphoproliferative diseases (n = 114, 42.5%), including malignant lymphoma (n = 59, 24.1%) and reactive lymphoid hyperplasia (n = 45, 18.4%), pleomorphic adenoma (n = 21, 8.6%), and cavernous hemangioma (n = 18, 7.4%).
  
  
  CONCLUSIONS
  The incidence of lymphoproliferative diseases, especially malignant lymphoma, was very high in Japanese patients.
authors.affiliation: Department of Ophthalmology, Sapporo Medical University, School of Medicine, Sapporo, Hokkaido, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Ohtsuka
authors.forename: Masato
authors.initials: M
authors.lastname: Hashimoto
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Suzuki
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D015994:Incidence; D007223:Infant; D007231:Infant, Newborn; D007564:Japan / Q000453:epidemiology; D008223:Lymphoma / Q000453:epidemiology* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009918:Orbital Neoplasms / Q000453:epidemiology* / Q000473:pathology