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FIGURE 8. Use of PET/CT to assist in radiation treatment planning. (A) MRI depicted asymmetric tissue in left nasopharynx. Radiotherapy contour line encircled this region (red line). (B) PET/CT revealed abnormal metabolic activity crossing midline from left nasopharynx to right nasopharynx, suggesting extent of tumor larger than that suggested by MRI. Radiotherapy contour line was adjusted accordingly (red line).

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