[Echotomography of the posterior cranial fossa].

The use of ultrasound tomography for the study of the posterior cranial fossa through intact bones of the skull permits to detect the contour of the cerebellar hemispheres. A scanning of the operational defect of the occipial bone allows one to determine the echotographical structure of the posterior cranial fossa and the adjacent area in a 2 plane picture which is easily correlated with the anatomical sawing of the head in the same plane. It was also possible to eliminate the contours of a recurrent cystous tumour of the cerebellum. The clinical results are correlated with the data of autopsies in experimental studies. The authors are of the opinion that the method of echoencephalotomography during surgical operations of the posterior cranial fossa is quite perspective.