With the beam scanning probe system for surgery, a pointer indicating the
observation point of a beam scanning probe is superimposed upon an image
of a lesion to be operated on in the head which is obtained via a TV
camera or a surgery microscope, and the superimposed image information is
registered as such in an image recording device. With the beam scanning
probe system for surgery, information of a cytological picture is also
registered in the image recording device. With the beam scanning probe
system for surgery, the image recording device registers the two image
information in a paired fashion. Through this arrangement, the beam
scanning probe system for surgery can smoothly locate, for a given
cytological picture, a site of a tumor to be treated from which the
picture was obtained, which will ease the operation.