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Methods. Thirty-five patients with previously irradiated primary brain tumors were evaluated for this study. 201Tl SPECT and CT were carried out during follow-up, which ranged from 3 to 125 months (median, 18 months). These findings were compared with the clinical outcome, as observed during the subsequent follow-up. Results. Sensitivity, specificity, and the overall accuracy of 201Tl SPECT were 82...