[Diagnosis and treatment of the fourth branchial fissure: a clinical report of 1 case and literature review].

The patient repeatedly suffer from pain in the left side neck for 4 years and had 1-2 recurrence per year. We used neck ultrasound and neck CT examination to find an abnormal soft tissue lumps exist in the patient's left neck root to the trachea esophageal ditch. Diagnostic analysis combines embryogenesis and anatomy, and the diagnosis results are infection with the fourth branchial fissure. The lesion site was completely excisioned with full hemp surgery, the incision showed I type healing after surgery, and there was no recurrence after six months of follow-up.