To evaluate the CT findings of ossicular disruption and fracture utilizing high resolution computed tomography(HRCT) of the temporal bone.

The authors retrospectively reviewed the HRCT scans of 11 patients with ossicular injuries between January 1998 and June 2002 using films in 8 patients, PACS in 3 patients. The type of ossicular injuries, temporal bone fracture, and associated adjacent injuries were evaluated.

Among the 11 patients of ossicular injuries, there were 10 cases of incudomalleal disruption, 4 cases of incudostapedial disruption, and 1 case of fracture of malleus, fracture of incus, disruption of long and lenticular process of incus, nonvisualization of processes of incus. The temporal bone fractures were longitudinal in 7 cases, transverse in l case. Other injuries were fracture of the carotid canal, caroticocavemous fistula, fracture of sphenoid and occipital bones.

Incudomalleal disruption was the most frequent tupe of ossicular injuries and associated temporal bone fracture was longitudinal type. HRCT using PACS was useful in evaluation of ossicular injuries than films.