“…In our experience, however, it is less frequently visualized by RTUS. This might be explained by less spatial resolution of the lower frequency ultrasonic probe (3.5 MHz) routinely employed for the right upper quadrant of abdominal survey, which is the reason de Lacey et al [13] favored OCG rather than sonography for the diagnosis of GBA. The majority of patients' gallbladders will localize within the focus of the transducer of 5 MHz; a linear transducer will demonstrate the superficial parts, such as gallbladder wall, more clearly than will the sector probe.…”