A thermal endoscope (100) is disclosed which includes at least one optical sensor (500) sensitive to radiation in the visible field and suitable for taking an image of an area of tissue on which a surgical operation is performed. Furthermore, near the end of the endoscope intended to be introduced into the patient's body, there is an optical window transparent to infrared radiation, through which the radiation in the infrared field, coming substantially from the same area of tissue whose image is taken by the optical sensor, hits an infrared radiation sensor (400).
