Abstract
Five cases of pilomyxoid astrocytoma (PmA) characterized by a monophasic pattern with a myxoid background were selected for a clinicopathological study from 23 cases previously diagnosed as pilocytic astrocytoma (PA). All PmA patients were either infants or young children (mean age 2.1 years), and all tumors were located in the optic chiasm/hypothalamus region. All cases received chemotherapy, which reduced tumor size, and the location of the tumor became confined to the optic chiasm. In two cases, tumor recurrence occurred 3 and 7 years after chemotherapy. Histology of the recurrent tumors showed the biphasic pattern of classical PA. Hence, we conclude that PmA might be an infantile form of PA and speculate that a subset of PmA in the optic pathway/hypothalamus originates from the optic chiasm, possibly derived from radial glia existing in the embryonic optic chiasm.
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Acknowledgements
We thank Mr. M. Shimizu, Mr. J. Moriya, Mr. K. Marukawa, Ms. T. Kurokawa, and Ms. Y. Saito for their technical assistance. This study was supported in part by grants from the Ministry of Education, Science, Sports and Culture, and the Ministry of Health, Labour and Welfare, Japan.
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This study was supported by grants from Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology (JST) Corporation.
H. Sawa is a member of the 21st Century COE Program for Zoonosis Control
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Chikai, K., Ohnishi, A., Kato, T. et al. Clinico-pathological features of pilomyxoid astrocytoma of the optic pathway. Acta Neuropathol 108, 109–114 (2004). https://doi.org/10.1007/s00401-004-0858-7
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DOI: https://doi.org/10.1007/s00401-004-0858-7