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Table 2: 
MR imaging evolution of ESBR from the immediate postoperative period to stability on follow-up
Immediate Postoperative MRIFollow-Up MRI at 2–6 Months
NSFSolid enhancement, T2-isointensity to brain (mostly similar to gray matter), distinctive C shape and vascular pedicle configurationsPersistent solid enhancement, persistent T2-isointensity to brain (mostly similar to gray matter), thickness reduction by 20%–30%, average thickness of 4.5 mm
Less well-defined C shape and vascular pedicle configurations, unchanged flap location
Fascia lataNonenhancing, variable T2 signal intensityMildly enhancing, increasing T2-hypointensity, thickness reduction by ≥50%, average thickness of 3.5 mm
Collagen matrix dural graftNonenhancing, nonvisible to ≤2 mmInseparable from enhancing granulation tissue at the reconstruction site, nonvisible to ≤2 mm
Fat graftFat signal intensity fills intracranial surgical bedFat signal intensity in retracted intracranial surgical bed, progressive resorption with volume reduction by ≥50%