[Neuroendocrine small-cell carcinoma of the gallbladder. An unexpected finding after diagnostic laparoscopy].

Background: Gallbladder cancer ranks fifth among oncological diseases affecting the gastrointestinal tract; nevertheless, it is the world's most common malignant tumor of the bile ducts. It is usually diagnosed after cholecystectomy and tends to have bad prognosis. Adenocarcinoma is the main histological finding, although other rare histologic types have been described among the actual literature.