An endoscopy cap is described, said cap having the particular feature of allowing distension of the mucosal surfaces undergoing endoscopic examination without disturbing the lateral vision at all, resulting in a significant reduction in the time needed to carry out the procedure and without negatively affecting the possibility of diagnosis of the various mucosal lesions which may be present. The device may be applied to any endoscope and is made of materials which are biocompatible with the environment in which they will be used.
