Table 1.

Incidence of Perforation

Author	No. Patients	Perforation	Retained Stones	Acute GB
Donahue et al.3	200	26%	13%	6%
Peters et al.2	283	40%	NL	5%
Huang et al.5	200	10%	5%	15%
Soper et al.6	250	32%	NL	5%
Strasberg et al.7	2201	9%	1%	NL

NL = not listed; GB = gallbladder