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Oligodendroglioma (Detailed)

Glial tumor defined by IDH mutation and 1p/19q codeletion with comparatively favorable prognosis.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Onkoloji department. Book Appointment →

What is Oligodendroglioma (Detailed)?

Oligodendroglioma arises from oligodendroglial precursor cells and accounts for 5-15% of primary brain tumors, predominantly affecting adults between 35-50 years. The hallmark molecular features — IDH1 or IDH2 mutation together with whole-arm codeletion of 1p and 19q — are mandatory for the diagnosis under the 2021 WHO classification.

Histologically the tumor shows monomorphic round cells with perinuclear haloes ("fried-egg" appearance), chicken-wire vasculature, and microcalcifications. WHO grade 2 (well-differentiated) and grade 3 (anaplastic) variants are recognized, with grade 3 showing higher cellularity, mitotic activity, and microvascular proliferation. TERT promoter mutation is frequently coexistent.

Compared with astrocytomas, oligodendrogliomas are remarkably chemosensitive. Standard treatment is maximal safe resection followed by radiotherapy plus PCV chemotherapy (procarbazine, CCNU, vincristine) or temozolomide. Long-term survival commonly exceeds 10-15 years for grade 2 disease and 7-10 years for grade 3.

Symptoms

Seizures (presenting feature in 50-80%)
Headache, particularly with frontal location
Personality and behavioral changes
Cognitive slowing and memory deficits
Focal neurological signs based on tumor location
Gait disturbance
Visual or sensory field disturbances
Speech difficulty if dominant hemisphere involved

Risk Factors

Adulthood (peak 35-50 years)
Caucasian ancestry
Slight male predominance
Prior cranial radiation
IDH mutation and 1p/19q codeletion (defining)
TERT promoter mutation (frequent coexistence)
No clear environmental etiology
Genetic susceptibility uncommon

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • First seizure in an adult
  • Persistent headache unresponsive to analgesics
  • Behavioral or cognitive change
  • New focal neurological deficit
  • MRI revealing a calcified cortical tumor
  • Routine neuro-oncology referral when oligodendroglioma is suspected

Treatment Methods

01
Surgery: maximal safe resection with awake mapping for eloquent areas
02
Radiotherapy: 54-60 Gy fractionated focal radiation
03
Chemotherapy: PCV protocol — first-line standard; temozolomide as alternative
04
Molecular testing: confirm IDH mutation and 1p/19q codeletion
05
Watch and wait possible after gross-total resection in select grade 2 cases
06
Recurrence: re-operation, re-irradiation, second-line chemotherapy, clinical trials
07
Supportive: antiepileptics (levetiracetam), neurocognitive rehabilitation
08
Long-term MRI follow-up every 3-6 months initially

Which Department to Visit?

You can visit our Onkoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.