Table 2.
Classification | MRI and/or 18F-FDG PET findings |
---|---|
I | <5 focal lesions; mild diffuse disease |
II | 5–20 focal lesions; moderate diffuse disease |
III | >20 focal lesions; severe diffuse disease |
18F-FDG, fluorine-18 fludeoxyglucose; PET, positron emission tomography.