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

• external auditory canal exostoses (surfer's ear): bilateral multiple broad based bony overgrowths

Siehe auch:

• Osteom