title: Detection of malignant hematopoietic cells in cerebral spinal fluid previously diagnosed as atypical or suspicious.
abstract: BACKGROUND
  Involvement of the cerebrospinal fluid (CSF) by hematopoietic malignancies may be difficult to document by morphology alone. In cases with low numbers of cells or ambiguous morphology, the diagnoses of "atypical" or "suspicious" may be used. The significance of these diagnostic terms in this scenario has not been well established.
  
  
  METHODS
  Between January 2000 and July 2004, 32 patients with known lymphoma or leukemia and an initial diagnosis of "atypical" or "suspicious" using morphologic criteria were identified. Subsequent flow cytometry (FC) and cytologic data from these patients were evaluated.
  
  
  RESULTS
  Of the 32 patients with an initial diagnosis of "atypical" or "suspicious," 40.6% (n = 13) had negative first and subsequent FC and morphologic evaluation of their CSF samples with follow-up up to 1 year. Nineteen patients (59.4%) had malignant hematopoietic cells identified in subsequent CSF samples by cytology and/or FC.
  
  
  CONCLUSIONS
  In patients with a previous history of lymphoma or a hematopoietic malignancy, a majority of the patients (59.4%) with an "atypical" or "suspicious" diagnosis on CSF will ultimately have malignant cells identified in the CSF by cytology and/or FC. Many of these patients can be identified more expediently with the concurrent utilization of flow cytometry.
authors.affiliation: Cytopathology Section, Laboratory of Pathology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892-1500, USA.
authors.forename: Malcolm
authors.initials: M
authors.lastname: Schinstine
authors.forename: Armando C
authors.initials: AC
authors.lastname: Filie
authors.forename: Wyndham
authors.initials: W
authors.lastname: Wilson
authors.forename: Maryalice
authors.initials: M
authors.lastname: Stetler-Stevenson
authors.forename: Andrea
authors.initials: A
authors.lastname: Abati
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D016543:Central Nervous System Neoplasms / Q000134:cerebrospinal fluid / Q000175:diagnosis* / Q000473:pathology; D002648:Child; D003581:Cytodiagnosis; D005260:Female; D005434:Flow Cytometry; D006413:Hematopoietic System / Q000473:pathology*; D006801:Humans; D007938:Leukemia / Q000134:cerebrospinal fluid / Q000175:diagnosis* / Q000473:pathology; D008214:Lymphocytes / Q000473:pathology*; D008223:Lymphoma / Q000134:cerebrospinal fluid / Q000175:diagnosis* / Q000473:pathology; D008297:Male; D008875:Middle Aged