The diagnostic value of labyrinthine fistula with multi-planar reconstruction in chronic otitis media by HRCT / 临床耳鼻咽喉头颈外科杂志

OBJECTIVE@#To study the ability of HRCT to delineate the semicircular canals and the diagnostic value of HRCT in identifying labyrinthine fistula in chronic otitis media (COM) by means of multiplanar reconstruction.@*METHOD@#Eighty-six patients (79 healthy ear and 93 failed ears) with chronic otitis media were scanned with HRCT, and the original data was processed with MPR. In the normal ears the semicircular canals form were individually observed and the canal geometry were compared in axial and coronal and s-MPR. In COM the destruction of the canal were observed and compared with the intraoperative findings.@*RESULT@#The full length of horizontal semicircular canal can be displayed in some cases and the full length of the three canals can't be displayed in any single coronal image but they can be individually displayed in one image in s-MPR. In the COM, six ears labyrinthine fistula were found in the axial and five ears in coronal images; six ears were located at the horizontal semicircular canal and two ears at the superior semicircular canal in the s-MPR, which corresponded with the intraoperative findings.@*CONCLUSIONS@#MPR can display the full path of individual semicircular canal in one image and is promising in identifying labyrinthine fistula.

The diagnostic value of multi-planar reconstruction in semicircular canals disease by HRCT / 临床耳鼻咽喉头颈外科杂志

OBJECTIVE@#To study the diagnostic value of high-resolution computed tomography (HRCT) and multiplanar reconstruction (MPR) in assessment of semicircular canals disease.@*METHOD@#Eighty-three patients were scanned with HRCT and the original data were processed with MPR. The semicircular canals full length was respectively observed in one image of MPR in the normal ears. The abnormal location of the canal were observed.@*RESULT@#In one image the full length of the horizontal, superior and posterior semicircular canal can be respectively displayed in one image of MPR in normal ears. By this way ,1 superior semicircular canal dehiscence (SSCD)was found in precaution group, 1 superior and 2 horizontal semicircular canal blocked, 1 vestibular aqueduct (VA) joined into superior semicircular canal and 2 VAs joined into posterior semicircular canal and abnormity of the three semicircular canals were found in SNHL.@*CONCLUSION@#MPR canould display the three canals full length in one picture and have a high specificity in the diagnosis of the semicircular canal abnormity.

Diagnostic value of high-resolution computed tomography imaging in congenital inner ear malformations / 临床耳鼻咽喉头颈外科杂志

OBJECTIVE@#To observe the inner ear structure with volume rendering (VR) reconstruction and to evaluate the role of high-resolution computed tomography (HRCT) in congenital inner ear malformations.@*METHOD@#HRCT scanning was performed in 10 patients (20 ears) without ear disease (control group) and 7 patients (11 ears) with inner ear malformations (IEM group) and the original data was processed with VR reconstruction. The inner ear osseous labyrinth structure in the images generated by these techniques was observed respectively in the normal ears and malformation ears.@*RESULT@#The inner ear osseous labyrinth structure and the relationship was displayed clearly in VR imaging in the control group,meanwhile, characters and degree of malformed structure were also displayed clearly in the IEA group. Of seven patients (11 ears) with congenital inner ear malformations, the axial, MPR and VR images can display the site and degree in 9 ears. VR images were superior to the axial images in displaying the malformations in 2 ears with the small lateral semicircular canal malformations. The malformations included Mondini deformity (7 ears), vestibular and semicircular canal malformations (3 ears), vestibular aqueduct dilate (7 ears, of which 6 ears accompanied by other malformations) , the internal auditory canal malformation (2 ears, all accompanied by other malformations).@*CONCLUSION@#HRCT can display the normal structure of bone inner ear through high quality VR reconstructions. VR images can also display the site and degree of the malformations three-dimensionally and intuitively. HRCT is valuable in diagnosing the inner ear malformation.