Abstract
The patient was an 85-year-old man who was admitted with vomiting and hematemesis caused by acute gastroenteritis and esophageal ulcer. During treatment, he developed biliary pseudolithiasis caused by ceftriaxone, necessitating laparoscopic cholecystectomy. Infrared spectroscopic examination of the gallbladder sludge revealed it to be consistent with ceftriaxone pseudolithiasis.