Introduction:
Insulinomas are rare functioning neuroendocrine (NEN) tumors. Up to 10% of insulinomas are associated with multiple endocrine neoplasia 1 (MEN1). Most of the tumors present with symptomatic hypoglycemia. Several non-invasive and invasive techniques are used to localize the lesion. We present a case of insulinoma presenting with seizure episodes with negative results on non-invasive imaging diagnosed and localized with endoscopic ultrasound.