The pathology “Acute perforated alithiasic cholecystitis” has the following characteristics:
The gallbladder is diminished (its length is less then 4.0 cm, the transverse diameter is less than 2.0 cm).
Tonicity is decreased (the gallbladder is atonic).
The gallbladder contour is unclear, interrupted, irregular, with aspect of homogeneous band, linear or double.
The gallbladder wall is thickened, as a rule it is greater than 0.8 cm.
The gallbladder contents is abnormal.
The focal modifications are absent or they are present with the aspect of sludge or sludge balls.
The diffuse modifications of various types are present.
The pains in the interested zone are present.
Murphy’s sign is positive.
The gallbladder data (hemogram) are the pathological ones.
The gallbladder obstruction is absent or present.
The perivesicular area can be without modifications or presents the inhomogeneous collections with the aspect of collections or abnormal accumulations, localized segmentally or on the whole gallbladder perimeter, including those at the distance. 
