Fig. 7

Imaging of meningioma by CT with contrast, MRI with contrast and IOUS. Arrows 1 refer to the fleshy tumor and arrows 2 refer to brain edema. Case a: Ill-defined mass without enhancement in CT and well defined with homogenous enhancement in MRI. Well-defined fleshy mass with homogenous hyper-echogenicity in IOUS. Case b: Well-defined fleshy mass with heterogeneous enhancement and necrosis in CT and MRI. Well-defined fleshy mass with hyper-echogenic periphery and hypo-echogenic center in IOUS. The ultrasound criteria of low-grades tumors as noted in case a are regular contours, hyper-echogenicity, homogeneity, and few amount of brain edema. The ultrasound criteria of high-grades tumors as noted in case b are irregular contours, necrosis, brain edema, hypo-echogenicity, and heterogeneity