Abstract: Disclosed is a system for forming a two-dimensional nuclear radiation image at a location inside an animal body and for transmitting a representation of the two-dimensional image to a location outside the body. In examining an animal body in accordance with the invention, a selected portion of the body is caused to form a nuclear radiation pattern, as by the ingestion or injection of a substance which gives out gamma radiation or by irradiation from an external source. The front end of an invented device is introduced into the body, as by way of a body cavity, to form a two-dimensional image of this nuclear radiation pattern. The middle part of the invented device transmits a representation of this two-dimensional image to the back end of the device, which is at a location outside the animal body which is being examined, where this representation forms an image of the selected animal body portion that can be viewed, recorded or otherwise utilized.