Evaluation of morphometric features of fossa navicularis using cone-beam computed tomography in a Turkish subpopulation

Mağat, Güldane

doi:10.5624/isd.2019.49.3.209

Cited by 8 publications

(10 citation statements)

References 15 publications

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“…Cankal et al 25 reported frequencies of 5.3% (26 of 492 dry skulls) and 3% (16 of 525 CT images). However, Bayrak et al, 1 Ersan, 3 Kaplan et al, 26 and Magat 27 all reported higher frequencies than in the current study: 7.6, 6.6, 17.4, and 27.5%, respectively.…”

Section: Discussioncontrasting

confidence: 67%

Morphological Measurement and Anatomical Variations of the Clivus Using Computed Tomography

Serindere

Günduz

Avsever³

2021

J Neurol Surg B Skull Base

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Objectives The aim of this study was to evaluate the clivus morphology, including fossa navicularis magna (FNM), canalis basilaris medianus (CBM), and craniopharyngeal canal (CC), on computed tomography (CT) images. Design This is a retrospective study. Setting Faculty of Dentistry, Department of Dentomaxillofacial Radiology. Participants The CT images of 500 patients (253 males; 247 females) were evaluated. Main Outcome Measures The prevalence of FNM, CBM, and CPC; the length, width, and depth of FNM; and CBM types were recorded. Also, a morphological analysis of the clivus (length of the clivus, angle between the clivus and the posterior margin of the foramen magnum, angle between the clivus and the dens axis, and anteroposterior diameter of the foramen magnum) was performed. Results FNM was identified in 5.4%, CBM in 4%, and CC in 0.8% of the study group. Type 5 CBM was not found. Type 6 was the most common CBM type. There was no significant correlation between the age and gender of patients with FNM. There were significant differences between the clivus length, the angle between the clivus and the dens axis, the anteroposterior diameter of the foramen magnum, and gender. Also, there was a significant difference between the angle between the clivus and the foramen magnum and age. Conclusions The anatomical variations of the clivus are rare and important for the oral and maxillofacial radiologist to make the differential diagnosis. These anatomical variations should not be confused with pathologic formations. The morphological measurements and anatomical variations of the clivus can be evaluated in detail on CT images.

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Section: Discussioncontrasting

confidence: 67%

Morphological Measurement and Anatomical Variations of the Clivus Using Computed Tomography

Serindere

Günduz

Avsever³

2021

J Neurol Surg B Skull Base

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“…The average depth, length, and width were 2.22 mm, 8.5 mm, and 5.37 mm, respectively. No sex predisposition for the presence of an FNM was reported; however, a positive correlation between patient age and length of the FNM was noted 22 . In a more extensive study of 723 CBCT scans, the prevalence of FNM was 6.6% and a predominance among males was reported.…”

Section: Discussionmentioning

confidence: 94%

Investigation of the prevalence and main features of skull-base anomalies and characteristics of the sphenoid sinus using cone-beam computed tomography

Akbulut

Demirel

Orhan

2022

JKAOMS

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Objectives This study aimed to define the prevalence and characteristics of skull base anomalies and the features of sphenoid sinus pneumatization (SSP). Materials and Methods Five hundred cone-beam computed tomography scans were evaluated retrospectively for the presence of fossa navicularis magna (FNM), canalis basilaris medianus (CBM), sphenoid emissary foramen (SEF), and/or Onodi cells (OC). Patterns of the SSP and sphenoid sinus mucosa dimensions (SSMD) were also recorded. Results The prevalence of FNM, CBM, SEF, and OC was 26.0%, 22.4%, 47.4%, and 18.4%, respectively. Two hundred sixty-two (52.4%) sellar-type SSP were defined, followed by post-sellar 191 (38.2%), pre-sellar 31 (6.2%), and conchal 16 (3.2%) types. The frequency of SSMD less than 1 mm, 1-3 mm, and greater than 3 mm was 40.6%, 38.4%, and 21.0%, respectively. An SEF was detected more frequently in females, while SSMD greater than 3 mm was more frequent in males. An FNM was more prevalent in the 18-29 and 30-39 age groups and SEF was significantly less frequent in patients over 60 years of age compared to other age groups. A sinus mucosa larger than 3 mm was more common in the younger than 18 year group. The frequency of post-sellar-type pneumatization was lower in patients younger than 18 years. Conclusion Skull-base anomalies are common and may be detected incidentally during imaging procedures. The sphenoid sinus, its variations, and pneumatization patterns should also be taken into consideration in imaging procedures performed for various purposes.

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“…Cankal and colleagues 15 presented separate analyses of dry skulls and imaging studies, and found FNM in 5.3% of dry skulls, but only in 3% of CT scans. However, Magat 5 presented an outlier study with an incredible reported 27.5% prevalence of FNM variations on CT scans. Their article mentioned the substantial difference from previous studies and related the change to differences in methodologies, ethnicities, and sample size.…”

Section: Resultsmentioning

confidence: 99%

“…The ranges of dimensions of FNM varied as well, with the mean diameter ranging from 2.85 to 5.37 mm, the mean length ranging from 5.12 to 8.55 mm, and the mean depth being approximately 2.2 mm in all 3 studies. 5 15 16 …”

Section: Resultsmentioning

confidence: 99%

“…3 In contrast, FNM has been reported as a notch-like, rounded osseous defect with corticated margins in the lower part of the clivus or basiocciput bone. 4 5 These variations have been traced to 2 possible theorized origins, vascular or notochordal. The vascular origin theory states that these variations are caused by persistent enlargement of emissary veins, which are veins that connect vessels outside the cranium to vessels inside the cranium.…”

Section: Introductionmentioning

confidence: 99%

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Anomalies of the clivus of interest in dental practice: A systematic review

McCartney

Mupparapu

2021

Imaging Sci Dent

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Purpose The clivus is a region in the anterior section of the occipital bone that is commonly imaged on large-volume cone-beam computed tomography (CBCT). There have been several reports of incidental clivus variations and certain pathological entities that have been attributed to the variations. This study aimed to evaluate the effects of these variations within the scope of dentistry. Materials and Methods Medical databases (PubMed, Scopus, and Web of Science) were searched using a controlled vocabulary (clival anomalies, cone-beam CT, canalis basilaris medianus, fossa navicularis magna, clival variation). The search was limited to English language, humans, and studies published in the last 25 years. The articles were exported into RefWorks® and duplicates were removed. The remaining articles were screened and reviewed for supporting information on variations of the clivus on CBCT imaging. Results Canalis basilaris medianus and fossa navicularis magna were the most common anomalies noted. Many of these variations were asymptomatic, with most patients unaware of the anomaly. In certain cases, associated pathologies ranged from developmental (Tornwaldt cyst), to acquired (recurrent meningitis). While no distinct pathognomonic aspects were noted, there were unique patterns of radiographic diagnosis and treatment modalities. Most patients had a normal course of follow-up. Conclusion Interpretation of CBCT volumes is a skill every dentist must possess. When reviewing large-volume CBCT scans, the clinician should be able to distinguish pathology from normal anatomic variations within the skull base. The majority of clivus variations are asymptomatic and will remain undetected unless incidentally noted on radiographic examinations.

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Evaluation of morphometric features of fossa navicularis using cone-beam computed tomography in a Turkish subpopulation

Cited by 8 publications

References 15 publications

Morphological Measurement and Anatomical Variations of the Clivus Using Computed Tomography

Morphological Measurement and Anatomical Variations of the Clivus Using Computed Tomography

Investigation of the prevalence and main features of skull-base anomalies and characteristics of the sphenoid sinus using cone-beam computed tomography

Anomalies of the clivus of interest in dental practice: A systematic review

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