Morphological relationships between external auditory canal and vital structures of tympanic cavity.
Head Face Med
; 18(1): 35, 2022 Nov 18.
Article
in En
| MEDLINE
| ID: mdl-36401294
ABSTRACT
PURPOSE:
We aimed to evaluate the morphology of the external auditory canal (EAC) using a three-dimensional (3D) reconstruction of computed tomography (CT) scans of the temporal bone to corroborate and predict important anatomical structures involved in middle ear surgery based on the EAC morphology.METHODS:
Temporal bone CT from 62 patients (120 ears) was used to perform 3D reconstruction (maximum intensity projection), of which 32 patients (60 ears) had chronic otitis media and 30 patients (60 ears) had normal temporal bones. The anatomical morphology of the EAC, tympanic sinus, vertical portion of the facial nerve, and jugular bulb were measured, and the anatomical relationship between the EAC morphology and important structures of the middle ear was analyzed.RESULTS:
In ears with chronic otitis media, the overhang of the inferior wall of the EAC was significantly more than that in normal ears, and the antero-posterior length of the bony tympanic ring was short. Furthermore, the tympanic sinus was shallow, and vertical portion of the facial nerve tended to run outward. The EAC morphology correlated with the tympanic sinus depth and outward orientation of the vertical portion of the facial nerve.CONCLUSION:
A severe overhang of the inferior wall of the EAC and short antero-posterior length of the bony tympanic ring indicates a higher possibility of a shallow tympanic sinus and an outward orientation of the vertical portion of the facial nerve. These findings aid in predicting the difficulty of tympanic sinus operation and reducing facial nerve damage risk during EAC excision.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Otitis Media
/
Ear Canal
Type of study:
Prognostic_studies
Limits:
Humans
Language:
En
Journal:
Head Face Med
Journal subject:
MEDICINA
/
ODONTOLOGIA
/
ORTOPEDIA
Year:
2022
Document type:
Article
Affiliation country: