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FIG 6. Example of follow-up study of vestibular schwannoma, illustrating a tumor with significant growth.
A, Initial image of a 2-cm vestibular schwannoma.
B, Magnified view of the initial image.
C, Follow-up image obtained after 7 months.
D, Tumor probability map of initial maximal diameter.
E, Tumor probability map of final maximal diameter.
F, Subtraction map of the two probability images shows voxels with a volume change of more than 50%. All voxels that show change show an increase in tumor volume. There is no evidence of significant misregistration between the images, and the overall volume increase is 38%.
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