A Case of Extramedullary Relapsed Acute Promyelocytic Leukemia Presenting as a Mass in the External Auditory Canal / 대한이비인후과학회지

Acute promyelocytic leukemia (APL) is a unique subtype of acute myelogenous leukemia for which complete remission is induced by using anticancer drugs with all-trans retinoic acid (ATRA). Extramedullary involvement at relapse is occasionally observed in patients with APL, and is said to be more common after treatment with ATRA. We describe a 35-year-old man who had a relapse due to a mass that developed in the external auditory canal after treatment with ATRA. He was successfully treated with arsenic trioxide and radiotherapy.