Figure 1. (A) Axial T1-weighted MRI showing the hypointense left parietal mass measuring approximately 6.5 × 5.0 × 7.0 cm, with 1.0 cm midline shift. (B) Axial post contrast T1-weighted MRI showing the heterogeneous, enhancing left parietal mass. (C) Sagittal T2-weighted image showing hyperintensity of the mass, with edema anteriorly. (D) Axial T2-weighted image depicting what is likely a CSF “cleft” (arrows), suggesting that the mass is extra-axial.
Figure 2. (A) DWI MRI showing the left parietal mass without reduced diffusion. (B) ADC MRI showing the mass with abundant surrounding vasogenic edema, and internally high diffusivity (mean ADC = 2.221 × 10-3cm2/sec). For the purposes of comparison, a meningiosarcoma in a 17 year old is shown on post-contrast T1-weighted MRI (C), with ADC map (D) that has internally low diffusivity (asterisks, ADC = 0.677 × 10-3 cm2/sec).