Fig. 2

T1 weighted contrast – enhanced MRI showed (a, b) original right frontoparietal glioblastoma (c) without right optic nerve involvement. At the initial symptom onset, T1 weighted contrast – enhanced MRI with fat suppression showed (d) no evidence of brain tumor recurrence but (e, f) right pre-chaismatic enhanced fusiform optic nerve tumor. At 3 months after symptom onset, T1 weighted contrast – enhanced MRI with fat suppression showed (h, i) right fusiform enlargement and an enhanced optic nerve tumor intraorbitally extending towards the optic chiasm even (g) no brain tumor recurrence. At 11 months after symptom onset, T1 weighted contrast – enhanced MRI with fat suppression showed (k, l) right optic nerve tumor extending to the optic chiasm and progressing in size (j) without brain tumor recurrence