Oligodendroglioma CT

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [4]Associate Editor(s)-in-Chief: Sara Mohsin, M.D.[5]Sujit Routray, M.D. [6]

Overview

Head CT scan may be helpful in the diagnosis of oligodendroglioma. Findings on CT scan suggestive of oligodendroglioma are round or oval, marginated, hypo- to isodense mass with hemorrhage, ribbon-like calcification, ill-defined enhancement following intravenous contrast administration, pressure erosion/remodelling of overlying skull, and marked ventricular enlargement suggestive of hydrocephalus.

CT

• Head CT scan may be helpful in the diagnosis of oligodendroglioma
• Findings on CT scan suggestive of oligodendroglioma are listed below:
  • Round or oval, sharply marginated mass involving the cortex or subcortical white matter
  • Hypodense to isodense mass
  • Hemorrhage
  • Overlying skull may show pressure erosion/remodelling
  • Calcification (70-90%)
    • Located centrally or peripherally
    • May be ribbon-like
  • Ill-defined enhancement (50%) following intravenous contrast administration
  • Marked ventricular enlargement suggestive of hydrocephalus

Oligodendroglioma CT characteristics

CT type	Tumor characteristics on CT
Non-contrast CT	Tumors are of mixed density i.e. from hypodense to isodense High-attenuation areas within the tumor are due to: Calcification most likely (70-90% of oligodendrogliomas are calcified), which can be located centrally, peripherally or they can be ribbon-like Hemorrhage (less commonly) Overlying skull may show pressure remodelling
Post-contrast CT	Approximately 50% of oligodendrogliomas enhance with degree of enhancement being extremely variable, ranging from: No enhancement to Strikingly vivid enhancement

Oligodendroglioma CT [2]

Heterogeneous region of contrast enhancement, edema, and mass effect is present in the left frontal lobe.Source: Dr. Frank Gaillard. Radiopaedia	Right temporal hypodense space occupying lesion which contains internal central calcifications.Source: Dr. Henry Knipe and Dr Frank Gaillard et al.. Radiopaedia	Oligodendroglioma that is highly calcified. [1]
Oligodendroglioma CT [3]