Brain Tumor Pathology

, Volume 35, Issue 4, pp 202–208 | Cite as

Molecular profiling of different glioma specimens from an Ollier disease patient suggests a multifocal disease process in the setting of IDH mosaicism

  • Char Loo Tan
  • Balamurugan Vellayappan
  • Bingcheng Wu
  • Tseng Tsai Yeo
  • Roger E. McLendonEmail author
Case Report


Ollier disease (OD) and Maffucci syndrome are rare conditions due to a post-zygotic somatic mutation that results in mosaicism. In addition to enchondromas and hemangiomas, some of these patients also develop other unrelated tumors, such as gliomas, that harbor IDH mutations, suggesting that an IDH mutation is a common genetic event in the tumorigenesis in this group of patients. We illustrate an interesting case of multifocal IDH-mutant astrocytomas in an OD patient with 8 years of follow-up. We first demonstrated identical IDH mutations in the brain tumor samples from various locations in this patient, but different 1p,19q results by fluorescent in-situ hybridization, different whole genome copy number profiles by OncoScan analysis, and a discrepant IDH2M131I mutation unique to one tumor, supporting a multifocal disease process in the setting of somatic IDH mosaicism.


Ollier Mosaicism IDH Glioma 1p,19q 


Compliance with ethical standards

Conflict of interest

We have no financial or conflict of interest to disclose.


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Copyright information

© The Japan Society of Brain Tumor Pathology 2018

Authors and Affiliations

  • Char Loo Tan
    • 1
  • Balamurugan Vellayappan
    • 2
  • Bingcheng Wu
    • 1
  • Tseng Tsai Yeo
    • 3
  • Roger E. McLendon
    • 4
    Email author
  1. 1.Department of PathologyNational University Health SystemSingaporeSingapore
  2. 2.Department of Radiation OncologyNational University Health SystemSingaporeSingapore
  3. 3.Department of NeurosurgeryNational University Health SystemSingaporeSingapore
  4. 4.Department of PathologyDuke University Medical Center 3712DurhamUSA

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