Longitudinal Temporal Bone Fracture with Incudomalleal dislocation

Findings:

Thin section temporal bone CT images demonstrate dislocation of the incudomalleal joint with marked widening of the articulation. A longitudinal fracture extends through the right temporal bone with minimal associated mastoid opacification.

Differential Diagnosis:

Trauma would be the most common cause of ossicular dislocation, but in the absence of fracture, barotrauma could cause IM dislocation.

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