Xanthogranuloma is one of non-Langerhans cell histocytic disorders. And adult-onset huge xanthogranuloma of the external auditory canal is very rarely reported, especially on this anatomical site. We introduce a case of adult-onset huge xanthogranuloma of the external auditory canal. An 32-year-old female presented with intermittent left bloody otorrhea for two months. Radiological studies showed a solitary mass on the posterior wall of external auditory canal that had no invasion or erosion of temporal bone. The mass that originated from the posterior wall of the external auditory canal was excised and the defect site was reconstructed with ipsilateral superficial temporalis fascia. Pathologically, this huge mass was diagnosed as xanthogranuloma. We report this case as a very rare case of adult-onset xanthogranuloma in the external auditory canal as well as its excellent long-term result of surgery with the review of the literatures.
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