External auditory canal exostoses
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Exostosis of the external auditory canal (also known as surfer's ear), is a benign bony overgrowth of the bony external auditory canal brought about by exposure to cold wind and water combined.
Epidemiology
The estimated prevalence in cold water surfers is thought to range between 70-80% 5-6,6.
Pathology
Exostoses are develop from prolonged irritation of the external auditory canal, typically with repeated cold seawater exposure, which is thought to stimulate new bone formation at the tympanic ring within the external auditory canal.
Radiographic features
CT
- broad-based or more focal circumferential bony overgrowth of the osseous external auditory canal
- bilateral in many cases
Differential diagnosis
- external auditory canal osteoma: unilateral focal, pedunculated bony overgrowth
- external auditory canal cholesteatoma: typically unilateral bony flakes with scalloping of the adjacent bone
See also
-<p><strong>Exostosis of the external auditory canal</strong> (also known as <strong>surfer's ear</strong>), is a benign bony overgrowth of the bony external auditory canal brought about by exposure to cold wind and water combined.</p><h4>Epidemiology</h4><p>The estimated prevalence in cold water surfers is thought to range between 70-80% <sup>5-6</sup>.</p><h4>Pathology</h4><p>Exostoses are develop from prolonged irritation of the external auditory canal, typically with repeated cold seawater exposure which is thought to stimulate new bone formation at the tympanic ring within the external auditory canal.</p><h4>Radiographic features</h4><h5>CT</h5><ul>- +<p><strong>Exostosis of the external auditory canal</strong> (also known as <strong>surfer's ear</strong>), is a benign bony overgrowth of the bony external auditory canal brought about by exposure to cold wind and water combined.</p><h4>Epidemiology</h4><p>The estimated prevalence in cold water surfers is thought to range between 70-80% <sup>5,6</sup>.</p><h4>Pathology</h4><p>Exostoses develop from prolonged irritation of the external auditory canal, typically with repeated cold seawater exposure, which is thought to stimulate new bone formation at the tympanic ring within the external auditory canal.</p><h4>Radiographic features</h4><h5>CT</h5><ul>
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