Rare Psychiatry News

Disease Profile


Prevalence estimates on Rare Medical Network websites are calculated based on data available from numerous sources, including US and European government statistics, the NIH, Orphanet, and published epidemiologic studies. Rare disease population data is recognized to be highly variable, and based on a wide variety of source data and methodologies, so the prevalence data on this site should be assumed to be estimated and cannot be considered to be absolutely correct.


US Estimated

Europe Estimated

Age of onset

All ages





Autosomal dominant A pathogenic variant in only one gene copy in each cell is sufficient to cause an autosomal dominant disease.


Autosomal recessive Pathogenic variants in both copies of each gene of the chromosome are needed to cause an autosomal recessive disease and observe the mutant phenotype.


dominant X-linked dominant inheritance, sometimes referred to as X-linked dominance, is a mode of genetic inheritance by which a dominant gene is carried on the X chromosome.


recessive Pathogenic variants in both copies of a gene on the X chromosome cause an X-linked recessive disorder.


Mitochondrial or multigenic Mitochondrial genetic disorders can be caused by changes (mutations) in either the mitochondrial DNA or nuclear DNA that lead to dysfunction of the mitochondria and inadequate production of energy.


Multigenic or multifactor Inheritance involving many factors, of which at least one is genetic but none is of overwhelming importance, as in the causation of a disease by multiple genetic and environmental factors.


Not applicable



Nervous System Diseases; Rare Cancers


Oligodendrogliomas are brain tumors arising from oligodendrocytes, a type of cell that makes up the supportive (glial) tissue of the brain. They can be low-grade (grade II) or high-grade (grade III, also called anaplastic). While they can be found anywhere within the cerebral hemisphere, they are most common in the frontal and temporal lobes. They are generally soft, grayish-pink tumors that often contain mineral deposits (calcifications), areas of hemorrhage, and/or cysts. They tend to grow slowly and may be present for many years before they are diagnosed. Common symptoms include seizures, headaches and changes in personality. Other symptoms vary by the size and location of the tumor.[1] The exact cause of opigodendrogliomas is unknown. Some appear to have a chromosome abnormality involving loss of chromosomes 1p and 19q.[1][2] Treatment generally involves surgical removal of the tumor followed by radiation therapy and/or chemotherapy. Recurrent tumors may need additional surgery, radiation and chemotherapy.[1]


Support and advocacy groups can help you connect with other patients and families, and they can provide valuable services. Many develop patient-centered information and are the driving force behind research for better treatments and possible cures. They can direct you to research, resources, and services. Many organizations also have experts who serve as medical advisors or provide lists of doctors/clinics. Visit the group’s website or contact them to learn about the services they offer. Inclusion on this list is not an endorsement by GARD.

Organizations Supporting this Disease

    Learn more

    These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.

    Where to Start

    • The National Cancer Institute provides the most current information on cancer for patients, health professionals, and the general public.

      In-Depth Information

      • Medscape Reference provides information on this topic. You may need to register to view the medical textbook, but registration is free.
      • The Monarch Initiative brings together data about this condition from humans and other species to help physicians and biomedical researchers. Monarch’s tools are designed to make it easier to compare the signs and symptoms (phenotypes) of different diseases and discover common features. This initiative is a collaboration between several academic institutions across the world and is funded by the National Institutes of Health. Visit the website to explore the biology of this condition.
      • Orphanet is a European reference portal for information on rare diseases and orphan drugs. Access to this database is free of charge.
      • PubMed is a searchable database of medical literature and lists journal articles that discuss Oligodendroglioma. Click on the link to view a sample search on this topic.


        1. Oligodendroglioma. American Brain Tumor Association. 2014; https://www.abta.org/brain-tumor-information/types-of-tumors/oligodendroglioma.html.
        2. Grill J. Oligodendroglial tumor. Orphanet. 2007; https://www.orpha.net/consor/cgi-bin/OC_Exp.php?lng=en&Expert=46484.
        3. Stevens GHJ. Brain Tumors: Meningiomas and Gliomas. Cleveland Clinic. 2010; https://www.clevelandclinicmeded.com/medicalpubs/diseasemanagement/hematology-oncology/brain-tumors/.