Ultrasound-guided percutaneous injection of Pseudomonas aeruginosa-mannose sensitive hemagglutinin for treatment of chyle fistula following neck dissection: Two case reports

RATIONALE: Chyle fistula is a rare but troublesome complication of neck dissection. Topical application of Pseudomonas aeruginosa-mannose sensitive hemagglutinin (PA-MSHA) injection has been reported as a novel, viable, and effective approach in the treatment of chyle fistula following neck dissection. However, there have been no reports regarding the treatment of chyle fistula using ultrasound (US)-guided percutaneous injection of PA-MSHA. PATIENT CONCERNS: We describe 2 patients with thyroid cancer who developed chyle fistula following neck dissection, which remained unresolved despite the use of conservative treatment. DIAGNOSES: Both the patients were diagnosed with chyle fistula by laboratory testing, which showed that drainage fluid triglyceride concentration was >100 mg/dL. INTERVENTIONS: When conservative treatment failed, a 2 mL undiluted PA-MSHA preparation was percutaneously injected at the effusion site of the left supraclavicular area under US guidance with aseptic technique. Concomitantly, the drainage tube was clamped for at least 30 minutes. OUTCOMES: Chyle fistula in both patients were successfully resolved with this technique within 2 or 4 days, without notable side effects. LESSONS: US-guided percutaneous injection of PA-MSHA is a simple and effective method to treat chyle fistula following neck dissection, which may serve as a useful addition to the medical treatment for cervical chyle fistula.