Yonsei Med J.  2009 Dec;50(6):845-847. 10.3349/ymj.2009.50.6.845.

A Case of Dysplastic Nevus of the External Auditory Canal Presenting with Conductive Hearing Loss

  • 1Department of Otorhinolaryngology-Head and Neck Surgery, Hallym University, Seoul, Korea. kcw5088@dreamwiz.com
  • 2Department of Pathology, College of Medicine, Hallym University, Seoul, Korea.


A nevus which is a benign melanocytic neoplasm rarely occurs within the external auditory canal (EAC). A dysplastic nevus presents atypical features both clinically and histologically, and is important as a potential precursor for melanoma. We present a case of a 33-year-old female patient with a dysplastic nevus in her EAC. Physical examination revealed a protruding mass arising from the posterior wall of the left cartilaginous EAC. The mass showed clinically characteristic findings of a melanocytic nevus. The patient underwent excisional biopsy via a transcanal approach under local anesthesia. Histopathological examination revealed an intradermal nevus with atypical melanocytes without pleomorphism. There was no evidence of recurrence two years after surgical excision.


External auditory canal; dysplastic nevus; intradermal nevus; conductive hearing loss

MeSH Terms

Dysplastic Nevus Syndrome/*diagnosis/*pathology/surgery
Ear Canal/*pathology/surgery
Hearing Loss, Conductive/*etiology/surgery
Treatment Outcome


  • Fig. 1 Endoscopic image reveals a dome-shaped papular mass arising from the left cartilaginous ear canal's posterior wall.

  • Fig. 2 Histopathologic findings of the mass showing nests of nevus cells in the dermis covered with normal skin (Hematoxylin-eosin, original magnification ×10).

  • Fig. 3 Histopathologic findings of the mass showing scattered clusters which were composed of round to oval shaped melanocytic cells (black arrow) (Hematoxylin-eosin, original magnification ×200).


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