DETECTION of space-occupying lesions has been the goal of echoencephalography from its early inception. The growing interest in these techniques resides mainly on its being particularly well suited for longitudinal examinations, rapid, harmless, and free of discomfort. Several authors1-7 have published data regarding "mass echoes" in series of supratentorial space-occupying lesions. All these authors, with some exceptions6,8 have utilized, with minor modifications, the unidimensional (A-mode) echoencephalography. In general, most workers have reached the conclusion that while in a varying proportion of cases mass echoes can be obtained, the detection of a displacement of midline structures appears to be a more reliable and constant result. However, some authors have expressed the opinion that unidimensional (A-mode) echoencephalography can be misleading in a small but significant group of cases, particularly when the midline structures are distorted or closely related to the lesion itself.9-11
An intensity-modulated, linear, two-dimensional (B-mode)