[Insulinoma exclusively localized during intraoperative ultrasonography].

The case of the patient surgically treated for diagnosed pancreatic insulinoma is reported. Pancreatic insulinomas are the most often diagnosed hormonally active tumors of pancreas. They are small in size, localized evenly in the head, body or tail of pancreas. Their precise location is not easy. This case confirms that the preoperative localization of the tumor is very difficult and preoperative image tests often fail. The performance of intraoperative ultrasonography (IOUS) led to the visualization of the tumor and the curative surgery.