Teenager with hyperinsulinemia and hypoglycemia

MRI of insulinoma
Axial T1 MRI without contrast of the abdomen (above left) shows a small, oval low signal intensity lesion in the tail of the pancreas which is nestled in the splenic hilum. The lesion is high signal intensity on the T2 MRI (above right). T1 MRI with contast in arterial (below left) and venous (below right) phases shows the lesion to fill in over time.

The diagnosis was insulinoma.