Fig. 2

Identification of malignancy by imaging studies. A cranial MRI image shows no abnormality on a T1-weighted image (A) and a high signal in the optic nerve of the right eye on a short tau inversion recovery image, but no findings suggestive of malignancy are seen (B). A PET-CT also shows no signs of malignancy (C). Brain SPECT shows that fluorodeoxyglucose is slightly more concentrated in the right eye than in the left eye in the early images, but no difference is seen between the left and right eyes in the late image and there is no significant accumulation in the trunk (D)