The Optic Nerve in the Posterior Ethmoid in Asians

Yeoh, Kian Hian; Tan, Kun

doi:10.3109/00016489409126065

Cited by 46 publications

(31 citation statements)

References 4 publications

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“…Our study revealed a prevalence of 36.6 % for Onodi cell as compared to 51 % in Singapore [22]. Chinese also showed a significantly higher rate of Onodi cells 48 % in our study.…”

Section: Ethmoidal Group Of Cells Pneumatizationsupporting

confidence: 49%

Pneumatization of Mastoid Air Cells, Temporal Bone, Ethmoid and Sphenoid Sinuses. Any Correlation?

Hindi

Alazzawi

Raman

et al. 2014

Indian J Otolaryngol Head Neck Surg

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The aim of this study is to assess the pneumatization of the paranasal sinuses (PNS) and other parts of temporal bone such as mastoid air cells and to investigate if there was any association between the aeration of these structures among the three major ethnic groups in Malaysia (Malay, Chinese, Indian) as this would be representative of Asia. A retrospective review of 150 computed tomography (CT) scans of PNS and temporal bones was done and analysed. The pneumatization of each area was obtained and compared using statistical analysis. Patients with a history of previous medical or surgical problems in the intended areas were excluded from the study. The pneumatization of the mastoid air cells and other temporal bone parts were noted to be symmetrical in more than 75 %. There was a positive correlation between the pneumatization of mastoid air cells and that of the sphenoid sinus. The prevalence of Agger nasi, Haller's and Onodi cells was observed to be significantly higher in the Chinese group. Preoperative assessment of the temporal bone and PNS with CT scan may be helpful in the evaluation of their anatomical landmark and decrease the possibility of surgical complications related to 3D structures.

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“…Our study revealed a prevalence of 36.6 % for Onodi cell as compared to 51 % in Singapore [22]. Chinese also showed a significantly higher rate of Onodi cells 48 % in our study.…”

Section: Ethmoidal Group Of Cells Pneumatizationsupporting

confidence: 49%

Pneumatization of Mastoid Air Cells, Temporal Bone, Ethmoid and Sphenoid Sinuses. Any Correlation?

Hindi

Alazzawi

Raman

et al. 2014

Indian J Otolaryngol Head Neck Surg

View full text Add to dashboard Cite

show abstract

“…The dehiscence may extend over a course of 4-10 mm. In a minority of cases, the optic nerve can traverse the aerated portion of the sphenoid sinus (Anon et al, 1996;Yeoh and Tan, 1994).…”

Section: Discussionmentioning

confidence: 99%

“…The study method had been previously described (Yeoh and Tan, 1994). It consisted of the following three steps: (1) Endoscopic spheno-ethmoidectomy was carried out using the standard Messerklinger technique (Stammberger, 1991).…”

Section: Methodsmentioning

confidence: 99%

“…It is defined as the most posterior ethmoid cell that features an endoscopically identifiable optic canal bulge (Kainz and Stammberger, 1992). An earlier study by the senior author (Tan HK) had reported on the high incidence of Onodi cells in Asian cadavers (Yeoh and Tan, 1994). Another less described entity is the overriding ethmoid cells, which lies superior and posterior to the anterior surface of the sphenoid sinus.…”

Section: Introductionmentioning

confidence: 99%

“…There have been several cadaveric studies on the anatomy of the sphenoid sinus (Van Alyea, 1941;Fujii et al, 1979;Lang, 1989;Kainz and Stammberger, 1992;Yeoh and Tan, 1994;Sethi et al, 1995a;Elwany et al, 1999;Thanaviratananich, 2003). These examined the anatomy of the sphenoid sinus and its intimate relationship with surrounding structures.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sphenoid sinus: An anatomic and endoscopic study in Asian cadavers

Tan

Ong

2007

Clinical Anatomy

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An anatomic and endoscopic study of 48 cadaveric heads (96 sphenoid sinuses) was undertaken to describe the anatomy of the sphenoid sinus in Asians. Sellar type of sphenoid sinus is the most common, present in 53 out of 96 sides (55%). Forty-five of the 48 heads had a dominant sphenoid cavity, of which 11 contained vital structures from both sides of the sphenoid sinus. The incidence of accessory septae, carotid artery, optic nerve, maxillary nerve, and vidian nerve bulges were 70.8%, 67.7%, 69.8%, 61.5%, and 64.6%, respectively. There is a significantly higher number of overriding ethmoid sinuses in Asian cadavers (46/96 sides) compared to western studies (P < 0.0005). Seven (15%) of these 46 sides were also Onodi positive. The rest of the overriding ethmoid cells were Onodi negative. Surgeons should be aware of the significantly higher number of overriding posterior ethmoid cells in Asian populations during functional endoscopic sinus surgery (FESS). The optic nerve is at risk during FESS surgery if the sphenoid sinus is sought behind the deepest point of these posterior ethmoid cells. These overriding posterior ethmoid cells may also confuse the unwary surgeon that he has entered the sphenoid sinus where in fact he is still operating in the posterior ethmoid cells.

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Onodi Cell Mucocele

Toh

Lee²

2007

Arch Otolaryngol Head Neck Surg

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The Optic Nerve in the Posterior Ethmoid in Asians

Cited by 46 publications

References 4 publications

Pneumatization of Mastoid Air Cells, Temporal Bone, Ethmoid and Sphenoid Sinuses. Any Correlation?

Pneumatization of Mastoid Air Cells, Temporal Bone, Ethmoid and Sphenoid Sinuses. Any Correlation?

Sphenoid sinus: An anatomic and endoscopic study in Asian cadavers

Onodi Cell Mucocele

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