external auditory canal osteoma

External auditory canal osteomas are rare focal pedunculated bony overgrowths of the osseous external auditory canal.

Radiographic features

  • solitary pedunculated bony overgrowth of the external auditory canal usually at the bony cartilaginous junction
  • unilateral
  • large lesions may be associated with earwax, debris or secondary cholesteatoma

Differential diagnosis

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