Table IV. Surgical management of the unknown group.

Patient no./age/sex	Time to diagnosis/surgery	Presentation	Radiological findings	Surgical findings and management	Length of stay (days)
1/81/F	28 h/31 h	Mild abdominal pain improved over 24 h	Pneumoperitoneum on X-ray at 28 h	No perforation identified. No bile leak. CBDE, removal of obstructing CBD stone, T-tube, drainage of retroperitoneum	22
2/87/F	Intra-ERCP/5 h	Mild abdominal pain; afebrile	Retroperitoneal air on X-ray at 4 h	No perforation identified. Bile stains. CBDE, removal of CBD stones, T-tube, drainage of retroperitoneum	18