title: [Clinical usefulness of thallium-201 chloride in the diagnosis of tumors (I)--Evaluation in brain tumors].
abstract: Forty-eight patients with suspected brain tumor were studied to evaluate the clinical efficacy of Thallium-201 (201Tl) SPECT. 201Tl scintigrams showed abnormal accumulation in 24/26 (92.3%) and 9/14 (64.3%) of patients with malignant and benign tumors, respectively. 201Tl tended to be retained more prominently in malignant brain tumors than in benign ones. The lesion-to-normal ratios (L/N ratios) of 201Tl demonstrated significant correlation with those of 18F-FDG (n = 5, r = 0.90, p = 0.044). L/N ratios were higher in patients with recurrent tumors than those with necrotic lesions (3.33 +/- 0.81 and 1.73 +/- 0.81, respectively, p = 0.0123). The positive predictive value of L/N ratios > or = 2.5 for diagnosing as recurrence and L/N ratios < 2.5 as necrosis were 83.3% and 100%, respectively. These results suggest that 201Tl scintigraphy may be useful to determine the malignancy of brain tumors and to differentiate recurrence from necrosis after therapeutic procedures.
authors.affiliation: Department of Nuclear Medicine, Gunma University School of Medicine.
authors.forename: K
authors.initials: K
authors.lastname: Endo
authors.forename: N
authors.initials: N
authors.lastname: Yui
authors.forename: K
authors.initials: K
authors.lastname: Suzuki
authors.forename: K
authors.initials: K
authors.lastname: Torizuka
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001932:Brain Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D002648:Child; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013793:Thallium; D013794:Thallium Radioisotopes; D015899:Tomography, Emission-Computed, Single-Photon
chemical_list: D013794:Thallium Radioisotopes; C027549:thallium chloride; D013793:Thallium