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FIG 1. MR images of 26-year-old man with disseminated medulloblastoma, obtained 6 years after surgery and 3 years after biopsy-proven metastatic skeletal disease.
A, Sagittal (600/9 [TR/TE]) MR image with fat suppression shows thin linear contrast enhancement along the pial surface of the spinal cord (arrows). Multiple enhancing skeletal metastases are also present in multiple vertebral bodies. CSF cytologic analysis obtained within 13 days of MR imaging was positive for tumor cells.
B, Sagittal (600/9) MR images with fat suppression, obtained 2 months after A, shows progression of disseminated disease, with enhancing tumor surrounding the spinal cord and filling the thecal sac (arrows). Four of four CSF samples obtained within 8 days of this MR examination were negative for tumor cells. The patient died 6 months later.
FIG 2. MR image of a 16-year-old boy, obtained 3 years after surgery and 4 years prior to death.
Sagittal (600/20) MR image with fat suppression shows two nodular contrast-enhancing lesions (arrows) within the distal thecal sac. Contemporaneous CSF cytologic analysis was positive.
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