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FIG 2. Eight-year follow-up MR imaging. The now 23-year-old patient returned with a strong progression of the exophthalmus and nearly complete functional loss of the left eye.
A, Unenhanced T1-weighted MR image of the skull base and orbit reveals a further progression of the tumor with enlargement of the intraorbital component, leading to a stronger compression and stretching of the optic nerve and progression of the exophthalmus.
B, Corresponding T2-weighted section shows the typical short T2 signal intensity characteristics of this infiltrating process, indicating its melanocytic origin.
C, Contrast-enhanced coronal T1-weighted MR image demonstrates involvement of the ophthalmic (VI) and maxillary (VII) divisions of the left trigeminal nerve. The right nervus canalis pterygoidei is easily distinguished. On the left side, the nervus canalis pterygoidei is compressed by the more lateral VII.
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