Computed Tomography Evaluation of the Correspondence Between the Arcuate Eminence and the Superior Semicircular Canal
| Autor: | Guilherme Girardi May, Fábio Pires Santos, Maria Gabriela Longo, Gustavo Rassier Isolan |
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| Rok vydání: | 2017 |
| Předmět: |
Computed tomography
Dehiscence Middle cranial fossa Arcuate eminence 03 medical and health sciences 0302 clinical medicine Statistical significance Temporal bone Image Interpretation Computer-Assisted medicine Humans skin and connective tissue diseases 030223 otorhinolaryngology Cranial Fossa Middle integumentary system medicine.diagnostic_test Semicircular canal business.industry Temporal Bone medicine.anatomical_structure Cross-Sectional Studies Surgery Neurology (clinical) Anatomic Landmarks Nuclear medicine business Tomography X-Ray Computed 030217 neurology & neurosurgery Student's t-test |
| Zdroj: | World neurosurgery. 111 |
| ISSN: | 1878-8769 |
| Popis: | BACKGROUND The arcuate eminence (AE) has been traditionally used in middle cranial fossa (MCF) surgery as a guide to accurate location of the superior semicircular canal (SSC) deep within the temporal bone. However, the anatomic relationship between the AE and SSC is controversial. We evaluated the anatomic coincidence between the AE and the SSC in the MCF surface. Distances between the most relevant anatomic structures in the MCF and prevalence of SSC dehiscence were measured. METHODS We analyzed 75 (150 sides) 0.75-mm slice thickness temporal bone computed tomography scans and classified the AE and SSC relationship as coincident and noncoincident. Radiologic findings were reported independently in a blind fashion by 2 authors. Data were presented as mean ± SD or frequency and percentage. Student t test or an unequal variance t test was used. Interobserver agreement among readings was assessed using κ statistic for categorical variables and intraclass Kendall tau-a correlations for continuous measures. P < 0.05 was considered to indicate statistical significance. RESULTS The AE matched the SSC in only 31.3% of cases. The AE could be localized as lateral as 11.6 mm from the SSC. It was impossible to identify the AE in 33 scans (22.0%). SSC dehiscence was found in 5 cases (3.3%). A few millimeters separated most analyzed landmarks, and a wide variability in secondary measurements was observed. CONCLUSIONS The AE does not systematically overlie the SSC and should not be routinely used as a reference to reach this structure in MCF surgery. |
| Databáze: | OpenAIRE |
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