Fig. 2

Female patient aged 30 years old, complaining of headache. A, B Axial pre and post contrast T1WI show: well-defined isointense extraxial dural based SOL in right frontal lobe with intense homogenous enhancement on CE-T1WI. C, D Axial pre and post contrast FLAIR images show: the lesion appear isointense on precontrast FLAIR images with surrounding mild perifocal edema and showing peripheral rim of enhancement on CE-FLAIR image. E CE-FLAIR subtraction image show: more delineation of the lesion from the surrounding edema with more evident enhancement. F, G Pre and post contrast FLAIR at same level: measurements of the SI, denoting the difference between pre and post contrast and confirms the presence of enhancement (CEI = 73, Lesion to background contrast ratio = 0.55). H, I Pre and post contrast T1WI: measurements of the SI in pre and post contrast images (CEI = 271, Lesion to background contrast ratio = 0.81). Final diagnosis: Meningioma