Ampullary neuroendocrine tumors (ANETs) are rare tumors which show characteristic CT features. We present a case of a 42-year-old female, in which the CT features of an ampullary tumor were atypical for a neuroendocrine tumor but was confirmed on histopathology and immunohistochemistry as an NET. The uniqueness of our case was that the lesion showed mild enhancement in the arterial phase which was persistent in the venous phase with wash out in the delayed phase