We investigated cases of postoperative fistulas associated with head and neck cancer. From April 2016 to December 2022, our hospital and affiliated hospitals collectively treated 10 cases of postoperative fistulas, all originating from malignant tumors. The fistulas manifested as pharyngocutaneous in five cases, orocutaneous in three cases, and tracheoesophageal in two cases. Eight of the 10 patients had a history of radiation exposure. Surgical repair of the fistula required one to three treatments. Closure of the fistula was successful in nine cases; however, surgery was abandoned in one case due to the patient’s poor general condition.
　The techniques used for fistula closure included the use of a pectoralis major myocutaneous flap in eight cases, deltopectoral （DP） flap in three cases, and free jejunum and simple suture in two cases each. Additionally, a free fibular flap, tongue flap, pedicled latissimus dorsi flap, anterior chest bipedicle flap, superficial temporal artery skin flap, and hinge flap were each used in one case. As a supplementary procedure for closure, tracheostomy site relocation was performed in two cases, and removal of the mandibular reconstruction plate was performed in one case.