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Extradural menigioma Extradural menigioma. Meningiomas arising from the coverings of the spinal cord are one of the two most common intradural extramedullary spinal tumors, representing 25-30% of all such tumor.
The vast majority (90%) of spinal meningiomas are intradural extramedullary in location. Occasionally (5%), purely extradural tumors are found. The remainder (5%) have both intradural and extradural components taking on a dumbbell appearance