Table 1: Niemeier’s classification of gallbladder perforation [4].

Type

Onset

Explanation

Type 1

Acute

Involves perforation of the gallbladder into the peritoneal cavity; it is not surrounded by any protective adhesions

Type 2

Subacute

Consists of a perforated gallbladder surrounded by an abscess that is walled off by adhesions

Type 3

Chronic

Includes the formation of a fistula between the gallbladder and some viscera