Ampullary neuroendocrine tumor diagnosed by endoscopic papillectomy in previously confirmed ampullary adenoma

Figure 1 A duodenoscopic image showed an enlarged major papilla with central umbilication and fine nodularity on ampullary orifice (A), endoscopic ultrasonography at the major ampulla revealed a 1. 1 × 0.9-cm, slightly hypoechoic round ampullary mass confined to the submucosa without definite wall disruption or adjacent invasion (B).