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AJNR - American Journal of Neuroradiology

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Evaluation of Pleomorphic Xanthoastrocytoma by Use of Positron Emission Tomography with [18-F]-Fluorodeoxyglucose and [11C]-Methionine Tracers

Naohiro Tsuyuguchi^,a, Yoshimi Matsuoka^a, Ichiro Sunada^a, Yasuhiro Matsusaka^a and Moududul Haque^a

^a From the Department of Neurosurgery (N.T., Y.M., M.H.), Osaka City University Medical School; the Department of Neurosurgery (Y.M.), Izumi City Hospital; and the Department of Neurosurgery (I.S.), Saiseikai Ibaraki Hospital.

View larger version (55K): [in a new window]   FIG 1. A, Axial postcontrast (Gd-DTPA) T1-weighted MR image shows a cystic lesion in the left temporal lobe. A poorly enhanced area is visualized at the anterior portion of the cyst (arrow head). B, Axial T2-weighted MR image shows a slightly hyperintense lesion around the cystic lesion appearing as areas of high signal intensity. C, FLAIR image shows a well-demarcated high-signal area around the cystic lesion.

View larger version (68K): [in a new window]   FIG 2. A, Axial FDG-PET image shows uptake of tracer in the lesion that is difficult to distinguish from cerebral cortex (arrow heads). The region of increased activity, which corresponds to the tumor, is in the left temporal lobe. B, Axial Met-PET image depicts high uptake of tracer in the lesion. The area of increased accumulation of Met is larger than that of FDG.

View larger version (166K): [in a new window]   FIG 3. Photomicrograph of a tissue section (hematoxylin and eosin stain x100) The section shows a moderately cellular glial neoplasm composed of giant astrocytes with pleomorphic nuclei in the area of cellular pleomorphism (arrow heads). There is no mitotic activity and no necrosis