References
1. Broniscer A, Baker SJ, West AN, et al. Clinical and molecular characteristics of malignant transformation of low-grade glioma in children. Journal of Clinical Oncology . 2007;25(6):682-689. doi:10.1200/JCO.2006.06.8213
2. Langdon FW. Multiple tumours of the brain; fibrocystoma of pons and cerebellum and multiple fibro-psammomata of dura, pia-arachnoid and cortex cerebri. Brain . 1895;18(4):551-560. doi:10.1093/brain/18.4.551
3.  Zenke K, Sakaki S, Nakagawa K. Association of Meningioma and Ependymoma. Neurologia Medico-Chirurgica. 1992;32(4):220-4. doi:10.2176/nmc.32.220
4. Modrek AS, Bayin NS, Placantonakis DG. Brain stem cells as the cell of origin in glioma. World journal of stem cells . 2014;6(1):43-52. doi:10.4252/wjsc.v6.i1.43
5. Jea A, Coscarella E, Chintagumpala M, et al. Medulloblastoma and juvenile pilocytic astrocytoma presenting as synchronous primary brain tumors in a child: Case report. Journal of Neurosurgery: Pediatrics . 2010;5(2):149-154. doi:10.3171/2009.9.PEDS09211
6. Molnár P, Hegedüs K. Adjacent astrocytoma and ependymoma: Dependent mixed neoplasia or unusual collision tumors? Surgical Neurology . 1984;22(5):455-460. doi:10.1016/0090-3019(84)90302-1
7. Rodriguez HA, Berthrong M. Multiple Primary Intracranial Tumors in von Recklinghausen’s Neurofibromatosis. Archives of Neurology . 1966;14(5):467-475. doi:10.1001/archneur.1966.00470110011002
8. Vertosick FTJ, Selker RG, Arena VC. Survival of patients with well-differentiated astrocytomas diagnosed in the era of computed tomography. Neurosurgery . 1991;28(4):496-501. doi:10.1097/00006123-199104000-00002
9. McCormack BM, Miller DC, Budzilovich GN, Voorhees GJ, Ransohoff J. Treatment and survival of low-grade astrocytoma in adults–1977-1988.Neurosurgery . 1992;31(4):636-642; discussion 642. doi:10.1227/00006123-199210000-00004
10. Mistry M, Zhukova N, Merico D, et al. BRAF mutation and CDKN2A deletion define a clinically distinct subgroup of childhood secondary high-grade glioma. Journal of Clinical Oncology . 2015;33(9):1015-1022. doi:10.1200/JCO.2014.58.3922
11. Vijapura C, Saad Aldin E, Capizzano AA, Policeni B, Sato Y, Moritani T. Genetic Syndromes Associated with Central Nervous System Tumors.Radiographics : a review publication of the Radiological Society of North America, Inc . 2017;37(1):258-280. doi:10.1148/rg.2017160057
12. Little MP, de Vathaire F, Shamsaldin A, et al. Risks of brain tumour following treatment for cancer in childhood: modification by genetic factors, radiotherapy and chemotherapy. International journal of cancer . 1998;78(3):269-275. doi:10.1002/(SICI)1097-0215(19981029)78:3<269::AID-IJC1>3.0.CO;2-T
13. Taylor AJ, Little MP, Winter DL, et al. Population-based risks of CNS tumors in survivors of childhood cancer: the British Childhood Cancer Survivor Study. Journal of clinical oncology : official journal of the American Society of Clinical Oncology . 2010;28(36):5287-5293. doi:10.1200/JCO.2009.27.0090
14. Rieske P, Zakrzewska M, Biernat W, Bartkowiak J, Zimmermann A, Liberski PP. Atypical molecular background of glioblastoma and meningioma developed in a patient with Li-Fraumeni syndrome.Journal of Neuro-Oncology . 2005;71(1):27-30. doi:10.1007/s11060-004-9181-3
15. Smith MDR, Hardman LJM, Earle KM. Contiguous glioblastoma multiforme and fibrosarcoma with extracranial metastasis. Cancer . 1969;24(2):270-276. doi:10.1002/1097-0142(196908)24:2<270::AID-CNCR2820240210>3.0.CO;2-5
16. Tanaka J, Garcia JH, Netsky MG, Williams JP. Late appearance of meningioma at the site of partially removed oligodendroglioma: case report. Journal of Neurosurgery . 1975;43(1):80-85. doi:10.3171/jns.1975.43.1.0080
17.  Robinson RG. A second brain tumor and irradiation. Journal of Neurology, Neurosurgery, and Psychiatry.1978:1005-1012. doi:10.1136/jnnp.41.11.1005
18. Pearl GS, Mirra SS, Miles ML. Glioblastoma Multiforme Occuring 13 Years After Treatment of a Medulloblastoma. Neurosurgery.1980;6(5):546-51. doi:10.1227/00006123-198005000-00009
19. Kanoke A, Kanamori M, Kumabe T, Saito R, Watanabe M, Tominaga T. Metachronous, multicentric glioma of pilocytic astrocytoma with oligodendroglioma-like component and oligodendroglioma through distinct genetic aberrations: Case report. Journal of Neurosurgery . 2013;118(4):854-858. doi:10.3171/2012.9.JNS112353
20. Butti G, Giordana MT, Paoletti P, Schiffer D. Multiple primary intracranial tumors of different cell types: Association of anaplastic astrocytoma and acoustic neurinoma - with review of the literature.Surgical Neurology . 1982;18(5):336-342. doi:10.1016/0090-3019(82)90144-6
21. Messahel B, Ashley S, Saran F, et al. Relapsed intracranial ependymoma in children in the UK: patterns of relapse, survival and therapeutic outcome. European journal of cancer (Oxford, England : 1990) . 2009;45(10):1815-1823. doi:10.1016/j.ejca.2009.03.018
22. Robison NJ, Campigotto F, Chi SN, et al. A phase II trial of a multi-agent oral antiangiogenic (metronomic) regimen in children with recurrent or progressive cancer. Pediatric blood & cancer . 2014;61(4):636-642. doi:10.1002/pbc.24794