Intrapulmonary Metastasis from Adenoid Cystic Carcinoma of the External Auditory Canal: A Case Report

External auditory canal adenoid cystic carcinoma (EAC) is rare and is associated with nonspecific clinical manifestations such as early ear pain. We report a patient with advanced lung metastases from adenoid cystic carcinoma (ACC) of the EAC, which is difficult to diagnose. Under general anesthesia, lengthened right temporal bone resection, parotidectomy, facial nerve resection, cervical lymph node dissection (I-III), partial mandibular resection, tumor resection in the inferior temporal fossa and lateral femoral flap repair were performed, followed by regular radiotherapy and chemotherapy. During 2 years of postsurgical follow-up, there was no recurrence. The combination of early detection, resection, postoperative radiotherapy, and chemotherapy can result in a good therapeutic effect.