Inclusion Criteria:  Diagnostic of a "Pure" Acute Calculous Cholecystitis. Older than 18 years old.  Exclusion Criteria:  Younger than 18 years old. Any concomitant diagnostic that could change the prognostic of a "Pure" ACC, for example: Cholangitis, Pancreatitis, Postoperative ACC, Acalculous cholecystitis.