External auditory canal osteoma

Case contributed by Mohd Radhwan Bin Abidin


Left ear pain. Otoscopy shows left external auditory canal hard mass obscuring view.

Patient Data

Age: 35 years
Gender: Male

HRCT temporal bone


There is a small pedunculated well-corticated bony outgrowth within the left external acoustic meatus. Its narrow-based stalk is seen arising from the anterior wall of the lateral-most bony portion of the left external acoustic canal.

No periosteal reaction or erosive changes of the underlying bone. The lesion is seen causing subtotal obstruction of the left external meatus.

Case Discussion

External auditory canal osteoma is a rare focal bony outgrowth at the external auditory canal. It is narrow-based and unilateral.

It needs to be differentiated with external auditory canal exostosis, which is usually broad-based and bilateral.

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