title: Langerhans cell histiocytosis of the thyroid diagnosed by fine needle aspiration cytology. A case report.
abstract: BACKGROUND
  Langerhans cell histiocytosis rarely involves the thyroid gland even in patients with multifocal disease. Unifocal disease apparently confined to the thyroid is even more rare.
  
  
  METHODS
  A 30-year-old woman presented with a 6-cm mass in the right and a 3-cm mass in the left lobe of the thyroid. Fine needle aspiration cytology showed isolated, loose aggregates and histiocytelike cells with grooved or contorted nuclei mixed in varying proportions with many mature eosinophils, scattered and small lymphocytes, multinucleated giant cells and foamy histiocytes.
  
  
  CONCLUSIONS
  The cytologic features of Langerhans cell histiocytosis are characteristic. A fine needle aspiration cytology diagnosis is confirmed by histopathologic studies, imunohistochemical staining and ultrastructural studies.
authors.affiliation: Department of Pathology, Sichuan Provincial People's Hospital, Chengdu, Sichuan 610072, People's Republic of China. zhjjong@mail.sc.cninfo.net
authors.forename: Hong
authors.initials: H
authors.lastname: Zhu
authors.forename: Da-xue
authors.initials: DX
authors.lastname: Hu
mesh_terms: D000328:Adult; D014408:Biomarkers, Tumor / Q000378:metabolism; D044963:Biopsy, Fine-Needle; D002277:Carcinoma / Q000473:pathology; D002467:Cell Nucleus / Q000473:pathology; D003937:Diagnosis, Differential; D005260:Female; D006644:Histiocytes / Q000378:metabolism / Q000473:pathology / Q000648:ultrastructure; D006646:Histiocytosis, Langerhans-Cell / Q000473:pathology* / Q000601:surgery; D006801:Humans; D002479:Inclusion Bodies / Q000473:pathology; D008854:Microscopy, Electron; D009418:S100 Proteins / Q000378:metabolism; D013961:Thyroid Gland / Q000473:pathology* / Q000601:surgery / Q000648:ultrastructure; D013964:Thyroid Neoplasms / Q000473:pathology* / Q000601:surgery / Q000648:ultrastructure
chemical_list: D014408:Biomarkers, Tumor; D009418:S100 Proteins