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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.
Dural Tail Sign â Meningioma. Dural tailing is seen on post contrast T1w MRI images, as focal thickening of the enhancing dura adjacent to the mass that resembles a tail extending from the lesion. The sign first described by Wilms and colleagues in relation to Meningioma.