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FIG 5. A, Posttraumatic conductive hearing loss in a 57-year-old man. Axial image shows a partial view of the stapes head of the long process of the incus.
B, Coronal reformation shows the presence of the stapes superstructure in the ovale window niche.
C, Oblique axial view in the plane of the stapes superstructure. The anterior crus is interrupted and the stapes head is posteriorly displaced in relationship to the long process of the incus.
D, Drawing the S-line perpendicular to the footplate and intersecting its midportion highlights the posterior displacement of the stapes. Surgical exploration confirmed the presence of a fracture of the anterior crus associated with an intact posterior crus, an incustapedial dislocation with a fibrous residual band in between, and a horizontal fissuration of the footplate. Continuity of the ossicular chain was restored by interposing a cartilagineous patch between the long process of the incus and the stapes head.
E, Oblique axial view of the contralateral normal ear. The S-line crosses the stapes head and the long process of the incus.
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