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Definition: Tailing factor. The tailing factor is a measure of peak tailing. It is defined as the distance from the front slope of the peak to the back slope divided by twice the distance from the center line of the peak to the front slope, with all measurements made at 5% of the maximum peak height.t is defined as the distance from the front slope of the peak to the back slope divided by twice the distance from the center line of the peak to the front slope, with all measurements made at 5% of the maximum peak height.
So the Dural tailing is one of the supportive findings for radiological diagnosis of Meningioma and not specific for Meningioma. It was initially proposed that dural tails resulted from direct tumor invasion but most of studies later failed to demonstrate any direct tumor involvement histopathologically. It is now therefore proposed that dural tails represents reactive change of adjacent dura mater.