A rare case of irritated seborrheic keratosis in the external auditory canal

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  • 稀有なる外耳道irritated seborrheic keratosisの1例

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A rare case of irritated seborrheic keratosis of the right external auditory canal is reported. A 17-year-old male complained of bloody otorrhea and pruritus. A dark brownish verrucous mass with a papillomatous surface was recognized in the posteroinferior aspect of the external auditory canal, and it was soft and hemorrhagic. The audiogram was within the normal range, and an X-ray examination showed a good pneumatization in the mastoid without any pathology. A CT scan demonstrated a narrowing of the external auditory canal due to the mass. Histologically the mass exhibited parakeratosis acanthosis, many squamous eddies and mild chronic inflammatory cell infiltration, and was thus diagnosed patholigically as irritated seborrheic keratosis. Extirpation was done under local anesthesia. Following the removal of the mass no complications or signs of recurrence have observed in the subsequent four years and four months.

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