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Technetium-99m(V)-DMSA washout from the tumor was highly dependent upon its histology and histologic malignancy. The delayed uptake ratio considerably reflected tumor histology and differentiated benign tumors from malignant tumors. The retention ratio and retention index significantly reflected tumor histology and histologic grade of primary brain tumors and clearly distinguished between benign and malignant tumors with statistically significant difference (p < 0.
The lesions were evaluated by using MRI imaging score, based on 9 MRI criteria. Based on the discrimination threshold of 0. 9 for mean MRI score, the gliomas were graded as low- or high-grade glioma. The Tc-GHA SPECT retention index was calculated as the ratio between delayed and early uptake ratios. Based on the discrimination threshold of 1 for Tc-GHA SPECT retention index, the gliomas were graded as low- or high-grade glioma.