Endosonographic image of an insulinoma

Endosonographic image of an insulinoma detected in a woman with recurrent episodes of hypoglycemia showing a well demarcated, homogenous hypoechoic mass lesion in the head of the pancreas adjacent to the common bile duct (CBD, above) and portal vein (PV, below) without invasion of these structures. The lesion had not been detected with other imaging modalities.