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A 59-year-old man was admitted to the hospital because of a painful preauricular mass.
He had been well until five months earlier, when he noticed a mild hearing impairment in the right ear. Several weeks later, the hearing loss worsened. Evaluation by an otologist showed no evidence of an acoustic neuroma. A cranial magnetic resonance imaging (MRI) scan (Figure 1) showed that the articular disk was absent; there was gross expansion of the joint capsule, with heterogeneous signal characteristics on T1-weighted and T2-weighted images, as well as heterogeneous enhancement. Low-signal regions were interpreted as areas of
Differential Diagnosis
Clinical Diagnosis
Dr. R. Bruce Donoff's Diagnosis
Pathological Discussion
Anatomical Diagnoses
Addendum
References
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