[A case of pancreatic neuroendocrine tumor with ring-like enhancement].

An 82-year-old female underwent contrast computed tomography (CT) that revealed multiple ring-like enhanced masses in the pancreatic tail. Additionally, the inside of the masses showed enhancement on contrast endoscopic ultrasound (EUS). She was diagnosed with a pancreatic neuroendocrine tumor on histopathological examination after EUS-guided fine-needle aspiration, and distal pancreatectomy and splenectomy were performed. In the resected specimen, toward the tumor center, tumor cells with lipid droplets and fibrosis were remarkably observed. These rare histopathological features well reflected the image findings of contrast CT and contrast EUS.