[Two-dimensional echoencephalography through a trepan defect in the skull].

With the aid of a non-adapted equipment echoencephalotomogrammes were obtained that revealed fine details of intracranial structures in normals and in patients with space-occupying lesions, these tomogrammes being comparable to those obtained after anatomic sections of the skull in the same planes. This becomes possible thanks to the absence of the bone as a limiting factor. Interpreting the conducted examinations as a model of intraoperative scanning, and considering the results of experimental craniotomies, a conclusion is made as the importance of such investigations especially in cases of bilateral space-occupying lesions.