Knowledge of the radiographic appearance and awareness of dropped gallstone are crucial to the diagnosis of this rare condition. Combined percutaneous and endoscopic removal of dropped gallstones can be a less invasive alternative to open surgical drainage.

From the manuscript

Combined percutaneous and endoscopic approach in management of dropped gallstones following laparoscopic cholecystectomy

Abstract
Dropped gallstones due to accidental perforation of gallbladder wall during laparoscopic cholecystectomy are often encountered. However, dropped gallstones as nidus of infection with subsequent abscess formation is a rare complication of laparoscopic cholecystectomy (0.3%). Most of the reported cases of complicated dropped stones required open surgical drainage. Minimally invasive measures were less frequently employed. We report a case of dropped gallstones that were removed endoscopically through a percutaneous drainage tract.