Transmural migration of azygous vein Hem-O-lok clip causing food bolus 3 months following uneventful minimally invasive oesophagectomy.

Background: Hem-o-lok clips are widely deployed in various laparoscopic and robotic operations. Their migration is not very common and majority of reported cases are limited to biliary, prostatic and vesico-urethral cases.
Methods: Herein, we would like to report the first case of transmural migration of Hem-o-lok clip from azygous vein stump following totally minimally invasive two-stage oesophagectomy for squamous cell carcinoma of the distal oesophagus, into the gastric conduit 3-months following uneventful discharge. The patient presented with 5-days history of worsening dysphagia.
Results: The subsequent gastroscopy revealed normal gastric conduit with two Hem-o-lok clips containing the azygous vein stump within its lumen at the level of the oesophago-gastric anastomosis, propagating a food bolus obstruction. The foreign body was successfully removed and the patient was discharged the same day without any complications at 5 months follow up.
Conclusion: Hem-o-lok clip migration trends to be a well-established event. However, their mechanism and exact incidence remains elusive to this date. To the best of our knowledge, their migration in oesophageal cancer surgery has not been reported.