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Contributors The case for this manuscript was identified by J-WC. Y-JC, W-HW, J-WC were involved in managing the case. K-NL performed simple mastoidectomy for the patient. Photographs and radiographic images were selected and annotated by J-WC. The manuscript was drafted by Y-JC.
Funding None declared.
Competing interests None declared.
Patient consent Parental/guardian consent obtained.
Provenance and peer review Not commissioned; externally peer reviewed.