This 35 year old man began having headaches eight months previouslsy. A CT scan was unremarkable. Two months prior to the current studies, he underwent brain biopsy, after progressive symptoms led to MR imaging. A low grade glioma was found, and he was treated with radiation. The MR demonstrates an area of mixed signal intensity on proton density (PD) and T2-weighted (T2) images in a left occipital region. Contrast enhancement shows the lesion to contain cystic elements. Thallium images show an anterior border of high uptake, consistent with a small region of tumor recurrence.
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Keith A. Johnson (, J. Alex Becker (