Multiple MRI scans of the nasopharynx listed in chronological order showing the progression of disease after multiple treatments. In Part A and B, the extent of the tumor was indicated with the white enclosed areas. In Part C to H, boundaries of the tumor are indicated (arrows). Dosimetries of the radiosurgery are indicated in Part B and D (concentric curved circles). Part F contained FDG-PET scan of the same period in the same nasopharyngeal plane as the MRI.