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Although gliomatosis cerebri is no longer a pathological diagnostic name, it is still an important disease state as a gliomatosis cerebri growth pattern. Here we report a case of gliomatosis cerebri originating from the left cerebral hemisphere that developed whole spinal cord. CASE A 10-year-old boy. He has a history of 13q-syndrome and left retinoblastoma. Left eye enucleation and chemotherapy (modified 98A1) have been performed. MRI in July 2017 showed no abnormalities, but in September 2018, he developed epilepsy. MRI revealed a gliomatosis cerebri that spreads extensively in the left cerebral hemisphere. Biopsy revealed anaplastic astrocytoma (MIB-1 LI; 22%, IDH1 / 2; WT, TERT C228T mutation positive) and IMRT (59.4Gy) and temozolomide (Stupp regimen) were performed in December 2018. In June 2019, neck pain developed. Head and neck MRI revealed that the tumor in the head increased lightly, and there was no suspicion of tumor growth in the brainstem, but the tumor progressed to the entire spinal cord. Therefore, radiation therapy was started from the lower brainstem that had not been irradiated last time to the entire spinal cord, and administration of bevacizumab was started. DISCUSSION Based on the single cell origin theory, the left hemisphere tumor and spinal cord tumor should be continuous. Since gliomatosis cerebri is visualized on MRI only after the tumor volume has increased and edema has occurred, it may appear as if there is no tumor in between. The spinal cord MRI was not taken, so it is only speculation, but it seems that tumor cells had probably infiltrated the spinal cord from the beginning, and it seems that it gradually increased because it was not irradiated. Considering the possibility of remote invasion as in this case, it is necessary to consider taking MRI of spinal cord at the first occurrence.

BT-05 A CASE OF GLIOMATOSIS CEREBRI WITH TOTAL SPINAL CORD EXTENSION