EAC osteoma

Findings:

Multiple MRI images demonstrate a subtle nonspecific signal abnormality projected over the left external auditory canal. Mild enhancement and T2 hyperintensity is present. Diffusion characteristics are indeterminate.

The CT images confirm that this is a long-standing ossified lesion with groundglass morphology internally, and adjacent bone remodeling including a lobulated projection from the left mandibular condyle which articulates with a portion of this lesion. The mass causes marked narrowing of the left external auditory canal.

Discussion/Differential Diagnosis:

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