ABSTRACT
A 6-year-old girl previously diagnosed with hereditary spherocytosis was admitted to our hospital with gallstones and cholangitis. Endoscopic retrograde cholangiopancreatography (ERCP) was performed, and fluoroscopy revealed a dilated common bile duct (CBD) without evident stones, possibly due to spontaneous excretion through the papilla of Vater. A 7-French plastic stent was inserted into the CBD. After the procedure, a marked increase in pancreatic enzyme levels was observed, and she was diagnosed with post-ERCP pancreatitis (PEP). Stent placement could have been a cause of pancreatitis; therefore, we removed the stent. Subsequently, recovery from pancreatitis was confirmed, although she suddenly complained of abdominal pain and was diagnosed with choledocholithiasis recurrence. ERCP was repeated, and fluoroscopy revealed a dilated CBD with a stone. A minimal endoscopic sphincterotomy (EST) was performed to reduce the risk of PEP, and a biliary dilation balloon placed across the papilla was gradually inflated until the waist of the balloon disappeared. Stones were extracted using a retrieval balloon catheter. The abdominal pain resolved immediately, and the patient recovered without developing PEP. To our knowledge, this is the first case report of a pediatric patient treated with minimal EST followed by papillary balloon dilation for choledocholithiasis.