International Session 30 　　Otology-Tumors

Adenoid cystic carcinoma(ACC)is a rare malignant tumor that primarily arises in the salivary glands but is occasionally found in the external auditory canal(EAC) .ACC of the EAC is often diagnosed late, with perineural invasion, low cervical lymph node metastasis, high local recurrence, and frequent distant metastasis.The main treatment options include surgery and radiotherapy.We report a case of ACC diagnosed following EAC tumor resection, treated with additional resection and reconstruction using rectus abdominis(RA)flap.A 40-year-old man presented with right otalgia, otorrhea, and ear fullness.Examination revealed entire circumferential swelling and marked stenosis of the EAC.Imaging suggested a malignant tumor in the cartilaginous EAC without bone destruction.An initial biopsy was inconclusive, and the patient opted against further biopsy.Partial EAC resection, partial parotidectomy, and skin grafting were performed.Pathological examination confirmed ACC.Subsequently, lateral temporal bone resection, total parotidectomy, right upper neck dissection, and RA flap reconstruction were performed.The patient remains under follow-up with no evidence of recurrence.