Fig. 2From: Ultrasound-guided versus traditional surgical resection of supratentorial gliomas in a limited-resources neurosurgical settingUltrasound ability to define tumor margins: a well-defined tumor margins, indicated by white arrows. b Moderately defined: the tumor margins can be clearly differentiated in some areas (white arrows) but not in other areas (white triangles). c Poorly differentiated: the tumor margins cannot be clearly differentiated (white triangles) all around the tumorBack to article page