Gallbladder neuroendocrine carcinoma: An important differential diagnosis of gallbladder adenocarcinoma

Gallbladder neuroendocrine carcinomas (NECs) are a rare but important differential diagnosis of gallbladder cancer. This case report highlights the importance of pathological diagnosis and the efficiency of endoscopic ultrasound-guided fine-needle aspiration. Pathological diagnosis should be attempted because the treatment of gallbladder NEC differs from that of gallbladder adenocarcinoma, especially in unresectable cases.