EUS is performed with radial imaging perpendicular to the endoscope shaft, and lateral imaging parallel to the shaft and biopsy channel. Radial imaging is preferred for some diagnostic and staging purpose because of ease of use as well as the production of a full 360-degree field of view. For operation smoothly and safety, the smaller external diameter (less than 11mm), the higher optical and ultrasonic resolution are required. In this paper, an EUS probe integrating an 8 MHz, 128 elements radial electrical scanning transducer and a wide-angle 8-million-pixel CMOS camera module is presented.