Case of the Week
Section Editors: Matylda Machnowska1 and Anvita Pauranik2
1University of Toronto, Toronto, Ontario, Canada
2BC Children's Hospital, University of British Columbia, Vancouver, British Columbia, Canada
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November 2, 2009
Incudomalleolar Dislocation
- The main causes of injury of the ossicular chain are: insertion of a foreign body into the external ear canal, skull trauma, and blows to the temporal, parietal, or occipital region with or without fracture of the temporal bone.
- Various types of ossicular injury may occur: incudostapedial or incudomalleolar joint separation, dislocation of the incus, dislocation of the malleoincudal complex, stapediovestibular dislocation, or fractures of the ossicles. Dislocation is the most common type of injury and occurs more often than fracture.
- Incudomalleolar dislocation is well visualized on axial CT scans, which show displacement of the head of the malleus (the "scoop of ice cream") from the body and short process of the incus (the "cone").
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