Facial Canal Dehiscence: A Report of 1,465 Stapes Operations

Objectives: The aim of this study is to investigate the scutum–cochleariform process (CP) and scutum–promontorium distances according to the mastoid pneumatization condition. Methods: Two hundred temporal multidetector computed tomography scans (90 males and 110 females) were evaluated retrospectively. The scutum-CP and scutum–promontorium distances were measured. Facial canal dehiscence (FCD) in the tympanic segment and mastoid pneumatization were also evaluated. Results: The distances between scutum-CP and scutum–promontorium were not different between males and females and between right and left sides. Facial canal dehiscence in the tympanic segment was detected: 5.6% (right) and 7.8% (left) in males and 5.5% (right) and 10.0% (left) in females. Grade 4 (100%) pneumatization was detected mainly in 55.6% to 57.8% of the patients in both genders. Grade 0 (0%) pneumatization (sclerosis) was detected in 22.2% to 28.2% of both males and females. In more pneumatized mastoids, the scutum-CP and scutum–promontorium distances increased. In sclerotic mastoids, the scutum-CP and scutum–promontorium distances decreased. Facial canal dehiscence rates were not related to the mastoid pneumatization levels. Conclusion: Cochleariform process is an important landmark to localize the tympanic segment of the facial canal. In sclerosed mastoids, scutum-CP and scutum–promontorium distances decreased. There was no relationship between FCD rates and mastoid pneumatization levels. It may be due to the development of FCD that occurs during the intrauterine period. In endoscopic and classic ear surgeries, mastoid pneumatization must be evaluated preoperatively to avoid facial nerve injuries.

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Facial canal dehiscence in patients with cholesteatoma: concordance between intraoperative inspection, computed tomography and neurophysiological findings

European Archives of Oto-Rhino-Laryngology ◽

10.1007/s00405-019-05416-6 ◽

2019 ◽

Vol 276 (7) ◽

pp. 1915-1920

Author(s):

Francisco Arias-Marzán ◽

Gemma de Lucas-Carmona ◽

Esteban Reinaldo Pacheco Coronel ◽

Pedro Javier Perez Lorensu ◽

Alejandro Jiménez-Sosa ◽

...

Keyword(s):

Computed Tomography ◽

Facial Canal ◽

Facial Canal Dehiscence ◽

Canal Dehiscence

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Prevalence of facial canal dehiscence and other bone defects by computed tomography

European Archives of Oto-Rhino-Laryngology ◽

10.1007/s00405-020-06013-8 ◽

2020 ◽

Vol 277 (10) ◽

pp. 2681-2686

Author(s):

Andrea Fabiola Hernandez-Trejo ◽

Karla Paola Cuellar-Calderon ◽

Jose Luis Treviño-Gonzalez ◽

Masao Yamamoto-Ramos ◽

Mario Alberto Campos-Coy ◽

...

Keyword(s):

Computed Tomography ◽

Bone Defects ◽

Facial Canal ◽

Facial Canal Dehiscence ◽

Canal Dehiscence

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Diagnostic efficacy of high-resolution computed tomography findings in patients of chronic suppurative otitis media atticoantral type

International Journal of Otorhinolaryngology and Head and Neck Surgery ◽

10.18203/issn.2454-5929.ijohns20204189 ◽

2020 ◽

Vol 6 (10) ◽

pp. 1854

Author(s):

Nikki Gajjar ◽

Neena Bhalodiya ◽

Simple Bhadania

Keyword(s):

Soft Tissue ◽

Temporal Bone ◽

Facial Canal ◽

Soft Tissue Density ◽

High Resolution Computed Tomography ◽

Suppurative Otitis Media ◽

Tissue Density ◽

Facial Canal Dehiscence ◽

Operative Findings ◽

Canal Dehiscence

Background: High resolution computed tomography (HRCT) provides information about anatomy and pathology of temporal bone and middle ear cleft, thus becoming important imaging modality in diagnosis and pre-operative planning in patients of chronic suppurative otitis media (attico-antral) CSOM (AA) type. The aim of study was to study disease extension and plan surgery accordingly in patients of CSOM (AA) and to study correlation between the HRCT findings and intra-operative findings of CSOM (AA) like soft tissue density mass, ossicular chain erosion, facial canal dehiscence, semi-circular canal erosion.Methods: Study of 70 patients clinically diagnosed of having CSOM (AA) in period between August 2018 to March 2020 was done at Sola civil hospital, Ahmedabad. All patients were advised HRCT temporal bone except those who had contraindications to CT scan, analysed and operated. Pre-operative CT-scan findings and intra-operative findings were compared for statistical analysis.Results: Soft tissue density was found in 100% of cases on HRCT temporal bone. Bony erosion seen in 25% of cases. 90% showed ossicular erosion. Lateral semi-circular canal fistula was observed in 10% of cases with facial canal dehiscence in 10% of cases. Intra-operative findings showed accuracy of HRCT in detecting soft tissue density to be 100%; bony erosion was observed in 25% cases. 10% patients had lateral semi-circular canal fistula. Facial canal dehiscence was seen in 15% cases.Conclusion: HRCT has proved quite useful and reliable to identify the disease extension before surgery and plan surgery accordingly.

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CT Detection of Facial Canal Dehiscence and Semicircular Canal Fistula: Comparison with Surgical Findings

Journal of Computer Assisted Tomography ◽

10.1097/00004728-199603000-00009 ◽

1996 ◽

Vol 20 (2) ◽

pp. 221-224 ◽

Cited By ~ 42

Author(s):

Takeo Fuse ◽

Yuichiro Tada ◽

Masaru Aoyagi ◽

Yukio Sugai

Keyword(s):

Semicircular Canal ◽

Facial Canal ◽

Facial Canal Dehiscence ◽

Canal Dehiscence

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Facial canal dehiscence rate: a retrospective analysis of 372 chronic otitis media cases

European Archives of Oto-Rhino-Laryngology ◽

10.1007/s00405-018-5198-7 ◽

2018 ◽

Vol 276 (1) ◽

pp. 79-83 ◽

Cited By ~ 2

Author(s):

M. Tayyar Kalcioglu ◽

Osman Kilic ◽

Ozan Tuysuz ◽

Serkan Serifler ◽

Muhammet Tekin

Keyword(s):

Retrospective Analysis ◽

Otitis Media ◽

Chronic Otitis Media ◽

Facial Canal ◽

Facial Canal Dehiscence ◽

Canal Dehiscence

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Cautionary Findings for the Presence of Facial Canal Dehiscence During Cholesteatoma Surgery

Ear Nose & Throat Journal ◽

10.1177/0145561319856886 ◽

2019 ◽

Vol 99 (5) ◽

pp. 327-330

Author(s):

Muammer Melih Sahin ◽

Melih Cayonu ◽

Ayse Secil Kayalı Dinc ◽

Suleyman Boynuegri ◽

Fulya Eker Barut ◽

...

Keyword(s):

Posterior Wall ◽

Ossicular Chain ◽

Facial Canal ◽

Canal Wall ◽

Tegmen Tympani ◽

Canal Wall Down ◽

Facial Canal Dehiscence ◽

The Relationship ◽

Cholesteatoma Surgery ◽

Canal Dehiscence

Our aim was to investigate the relationship between facial canal dehiscence (FCD) and surgical findings and procedures in patients with cholesteatoma. A total of 186 patients (118 males, 39.2 ± 15 years) who underwent surgery for advanced cholesteatoma between 2013 and 2018 were included in the study. The relationship between FCD and surgical findings was investigated via the surgical registries. The prevalence of FCD was 36.6% (68/186). The prevalence of FCD was 44%, and 13.2% for the patients who underwent canal wall down mastoidectomy (62/141) and canal wall up mastoidectomy (6/45), respectively ( P < .001). Facial canal dehiscence was detected in 73.9% of the 23 patients who had a lateral semicircular canal (LSCC) defect ( P < .001), in 61.9% of 21 patients who had a tegmen tympani defect, and in 58.1% of the 31 patients who had erosion on the posterior wall of the external auditory canal (EAC; P < .05). The prevalence of FCD was 3.1% in patients with isolated incus erosion, 59.1% in patients with erosion of malleus and incus, 60.7% in patients with erosion of stapes suprastructure and incus, and 43.2% in patients with whole ossicular chain deformation ( P < .001). The defects on LSCC, EAC, tegmen tympani, and malleus and incus might be cautionary findings for the presence of FCD during cholesteatoma surgery.

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