Plastic biliary stents are being increasingly used in benign biliary disease including
postoperative bile leaks [1]. Occasionally, these stents may migrate distally, most passing spontaneously without
causing problems. Perforation of the colon due to migrated stents is a very rare but
reported complication.
A 57-year-old lady was referred 3 days after a laparoscopic cholecystectomy with right
hypochondrial pain. Blood tests revealed leucocytosis, normal bilirubin but slightly
raised alkaline phosphatase, alanine transaminase, and gamma glutamyl transferase.
Ultrasonography and computed tomography (CT) scan of the abdomen demonstrated a right
subphrenic fluid collection, and magnetic resonance cholangiopancreatography (MRCP)
suggested a retained stone in the common bile duct ([Fig. 1]). A laparoscopic wash out and drainage was performed, draining 500 mL of bile, which
ameliorated her symptoms. An endoscopic retrograde cholangiopancreatography (ERCP)
demonstrated small cystic duct leak but no retained stone. So a polyethylene 10-Fr
7 cm long biliary endoprosthesis (Cotton–Leung, Wilson-Cook Medical Inc., Winston-Salem,
North Carolina, USA) was inserted. Her condition improved, bile leak stopped, abdominal
drain was removed, and she was discharged from hospital.
Fig. 1 Magnetic resonance cholangiopancreatography revealed a stone at the lower end of the
common bile duct.
She re-presented 4 weeks later with a 3-day history of abdominal pain and no bowel
movement. She was pyrexial and had peritonism in the lower abdomen. The biliary stent
was seen to be present in the lower abdomen on abdominal radiograph ([Fig. 2]). Laparotomy revealed perforated stent through a sigmoid diverticulum with minimal
contamination ([Fig. 3]). The stent was removed and the perforation was closed with a covering loop transverse
colostomy. Her postoperative recovery was unremarkable, and 2 months later she underwent
an uneventful sigmoid colectomy and closure of the colostomy.
Fig. 2 Radiograph showing migrated biliary stent at pelvis.
Fig. 3 Operative photograph showing perforated biliary stent through the sigmoid colon.
Only nine other cases of colonic perforation (five free perforation in the peritoneum,
one through the cecal diverticulum with localised abscess, and three to the adjacent
organ or fistulating through the skin) have been reported [2]
[3]
[4]
[5]. (Not all references cited due to lack of space.)
Stent perforation should be considered in a patient presenting with abdominal pain
and peritonism following placement of a biliary endoprosthesis. Stents should always
be removed following an exchange procedure to prevent risk of perforation.
Endoscopy_UCTN_Code_CPL_1AK_2AD
