[Role of helical computed tomography in petrous bone trauma: about 12 cases at the University Hospital Ibn Rochd of Casablanca].

Temporal bone injuries occur in 14-22% of skull fractures occurring due to head trauma. The purpose of this study is to understand the role of helical computed tomography in petrous bone trauma and to show the different types of fractures and the associated lesions. We conducted a retrospective study of 12 patients with petrous bone trauma (including 10 men and 2 women) over a period of 14 months. The average age of patients was 30, ranging from 18 to 42 years. High-resolution multi-slice computed tomography of petrous bone without contrast agent injection, with infra-millimeter slices thickness of 0.6mm every 0.3mm, allowed to detect the following fractures: 8 extralabyrinthine transverse fractures; 1 extralabyrinthine longitudinal fracture; 2 translabyrinthine fractures and 1 oblique fracture. The associated lesions were dominated by: 5 ossicular lesions; 4 cases of temporal bone involvement and 2 cases of geniculate ganglion involvement. High-resolution computed tomography can confirm the presence of a fracture, show the orientation of the fracture line and specify the different structures affected. It can be performed for emergency assessment or after a period of observation.