title: (201)Tl-SPECT, (1)H-MRS, and MIB-1 labeling index of central neurocytomas: three case reports.
abstract: BACKGROUND
  The proliferative activity and metabolic features of three central neurocytomas were investigated using the findings of thallium-201 single photon emission computed tomography ((201)Tl-SPECT) and proton magnetic resonance spectroscopy ((1)H-MRS), and the MIB-1 labeling index (MIB-1 LI).
  
  
  METHODS
  The early and delayed (201)Tl indices were calculated as the ratio of tumour to normal brain tissue uptake by (201)Tl-SPECT. In vivo single-voxel (1)H-MRS was performed with echo time of 272 msec to evaluate the metabolites including choline (Cho), N-acetyl aspartate (NAA) and creatine/phosphocreatine (Cre). An external standard reference was used to semiquantitate each metabolite. MIB-1 LI was determined in the surgical specimens.
  
  
  RESULTS
  The MIB-1 LI was 0.5%, 1.2%, and 7.5% in an atypical central neurocytoma without intraventricular extension. Significant (201)Tl uptake was observed on delayed images in all three central neurocytomas. (1)H-MRS showed the high Cho peaks relative to the NAA and Cre peak. The signal at 3.55 ppm, which may be due to inositol or glycine, was observed in one central neurocytoma.
  
  
  CONCLUSIONS
  Both (201)Tl-SPECT and (1)H-MRS did not reflect the proliferative potential of central neurocytomas.
authors.affiliation: Department of Neurosurgery, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, 980-8574 Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kanamori
authors.forename: T
authors.initials: T
authors.lastname: Kumabe
authors.forename: H
authors.initials: H
authors.lastname: Shimizu
authors.forename: T
authors.initials: T
authors.lastname: Yoshimoto
mesh_terms: D000328:Adult; D034961:Antigens, Nuclear; D001932:Brain Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D002455:Cell Division; D005998:Glycine / Q000378:metabolism; D006801:Humans; D019394:Ki-67 Antigen; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D009367:Neoplasm Staging; D018306:Neurocytoma / Q000000981:diagnostic imaging* / Q000473:pathology; D009687:Nuclear Proteins / Q000032:analysis*; D013794:Thallium Radioisotopes; D015899:Tomography, Emission-Computed, Single-Photon
chemical_list: D034961:Antigens, Nuclear; D019394:Ki-67 Antigen; D009687:Nuclear Proteins; D013794:Thallium Radioisotopes; D005998:Glycine