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Two cases of ringlike enhancement on MRI mimicking malignant brain tumors

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Abstract

The present study was performed to investigate two cases with ringlike enhanced lesions mimicking malignant tumors on magnetic resonance imaging (MRI) and to determine the utility of thallium-201 single-photon emission tomography (201Tl-SPECT) and diffusion-weighted MR imaging (DWI) for differential diagnosis between neoplastic and nonneoplastic lesions. One patient was a 50-year-old man who presented with a right caudate lesion. The 201Tl-SPECT study revealed no uptake in the lesion. Stereotactic biopsy was performed, and pathological findings indicated cerebral infarction. The other patient was a 58-year-old woman who presented with a right frontal lesion with edema. DWI showed a hypointense signal, and the apparent diffusion coefficient (ADC) revealed a hyperintense signal in the lesion. Stereotactic biopsy with endoscopy was performed, and the pathological findings suggested a demyelinating disease. Combined 201Tl-SPECT and DWI studies may be useful for differential diagnosis between neoplastic and nonneoplastic lesions. However, stereotactic biopsy should be performed for the final pathological diagnosis.

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Correspondence to Yoshiyuki Tanaka.

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Tanaka, Y., Uematsu, Y., Owai, Y. et al. Two cases of ringlike enhancement on MRI mimicking malignant brain tumors. Brain Tumor Pathol 23, 107–111 (2006). https://doi.org/10.1007/s10014-006-0207-8

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