A neoplasm with neuroendocrine differentiation that arises from the gallbladder. It includes well differentiated neuroendocrine tumors (low and intermediate grade) and poorly differentiated neuroendocrine carcinomas (high grade). The disease is gallbladder neuroendocrine neoplasm (MONDO_0024502). Also known as: gall bladder NET, gall bladder neuroendocrine neoplasm, gall bladder neuroendocrine tumor, gall bladder neuroendocrine tumor, well differentiated, low or intermediate grade, gall bladder neuroendocrine tumour, neuroendocrine neoplasm of gall bladder.