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. 2021 Jan 6;8(1):27. doi: 10.3390/children8010027

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Serial audiometry of patients. (A) Pure tone audiometry (PTA) did not reveal any abnormality at first event of tinnitus. (B) Two weeks thereafter, in the first consolidation period, ATRA was used and the patient developed headache and tinnitus in both ears. Severe hearing loss at 250 Hz, 500 Hz, and 1000 Hz on the left side at 2 weeks later. (C) One month later, PTA showed improvement after treatment of dexamethasone.

Serial audiometry of patients. (A) Pure tone audiometry (PTA) did not reveal any abnormality at first event of tinnitus. (B) Two weeks thereafter, in the first consolidation period, ATRA was used and the patient developed headache and tinnitus in both ears. Severe hearing loss at 250 Hz, 500 Hz, and 1000 Hz on the left side at 2 weeks later. (C) One month later, PTA showed improvement after treatment of dexamethasone.