Magnetic resonance imaging evaluation of treatment efficacy and prognosis for brain metastases in lung cancer patients after radiotherapy: A preliminary study.

9 , 14 It is generally believed that the Cho/Cr ratio is > 2 after glioma treatment and that this is a reliable threshold to distinguish between tumor progression and pseudoprogression, but can MRS accurately evaluate pseudoprogression and tumor progression after radiotherapy for brain metastases? In the present study, all patients showed an overall trend of Cho/Cr increasing from low to high before radiotherapy to 3, 6, 9, and 12 months after radiotherapy.

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