Computed Tomography of the Ethmoid Labyrinth and Adjacent Structures

Teatini, G. P.; Simonetti, Giovanni; Salvolini, U.; Masala, W.; Meloni, Francesco; Rovasio, S; Dedola, G

doi:10.1177/000348948709600301

Cited by 70 publications

(15 citation statements)

References 20 publications

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“…Likewise, this high prevalence may be explained by the criteria we used to define protrusion and dehiscence. However, previous studies reported a wide range of protrusion rates of 8 to 70% [31, 32]. Fuji et al found that 4% of optic nerves were dehiscent of bone in the lateral sphenoid [26].…”

Section: Discussionmentioning

confidence: 99%

Anatomic Variation of Sphenoid Sinus and Related Structures in Libyan Population: CT Scan Study

Hewaidi

Omami

2008

Libyan J Med

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BackgroundSphenoid sinus is the most inaccessible paranasal sinus, enclosed within the sphenoid bone and intimately related to numerous vital neural and vascular structures. Anatomic variation of the sphenoid sinus is well documented and may complicate surgery in such a place.ObjectiveTo outline the surgically risky anatomic variants of the sphenoid sinus as well as the variable relationships between the sinus and related neurovascular structures, for the safe removal of intrasphenoid and pituitary lesions.Materials and MethodsWe undertook a prospective review of 300 paranasal sinus CT scans of Libyan patients; coronal CT scans were obtained by special parameter techniques. We assessed pneumatization of pterygoid process (PP), anterior clinoid process (ACP), and greater wing of sphenoid (GWS); we also examined protrusion and dehiscence of internal carotid artery (ICA), optic nerve (ON), maxillary nerve (MN), and vidian nerve (VN) into the sphenoid sinus cavity.ResultsPneumatization of PP, ACP, and GWS were seen in 87 (29%), 46 (15.3%), and 60 patients (20%), respectively. Protrusion of ICA, ON, MN, and VN were noticed in 123 (41%), 107 (35.6%), 73 (24.3%), and 81 patients (27%), respectively; dehiscence of these structures was encountered in 90 (30%), 92 (30.6%), 39 (13%), and 111 patients (37%), respectively. Statistically, there was a highly significant association between ACP pneumatization and ICA protrusion, ACP pneumatization and ON protrusion, PP pneumatization and VN protrusion; and GWS pneumatization and MN protrusion (p-value < 0.001).ConclusionThe sphenoid sinus is highly variable; this variability necessitates a comprehensive understanding of the regional sphenoid sinus anatomy by a detailed CT scan sinus examination before surgery in and around the sinus. This study indicates the possibility of a racial anatomical variation of the sphenoid sinus in the Libyan population.

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Section: Discussionmentioning

confidence: 99%

Anatomic Variation of Sphenoid Sinus and Related Structures in Libyan Population: CT Scan Study

Hewaidi

Omami

2008

Libyan J Med

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“…The pneumatization can extend into the greater wing of sphenoid, pterygoid process, clivus, and sometimes into the anterior clinoid process. [ 6 7 ]…”

Section: Introductionmentioning

confidence: 99%

Assessment of variations in sphenoid sinus pneumatization in Indian population: A multidetector computed tomography study

Hiremath

Gautam

Sheeja

et al. 2018

Indian Journal of Radiology and Imaging

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Background and Purpose:The purpose of our study was to assess the prevalence of variations in the extent of sphenoid pneumatization in the Indian population and compare with existing literature.Materials and Methods:This retrospective study included 500 patients who underwent CT of the paranasal sinuses. The multiplanar reformations of paranasal sinus were assessed for the type of pneumatization of the sphenoid sinus and type of clival, lateral recess, lesser wing, and anterior recess extensions.Results:The conchal, presellar, incomplete sellar, and complete sellar types comprised 0%, 1.2%, 22.2%, and 76.6% of patients. The extensions of pneumatization subtypes in the study population were clival in 76.6% subjects; lateral recess, lesser wing, and anterior recess in 59.7%, 20.4%, and 20.4% of sinuses, respectively. The pure forms were seen in 25.4% and combined forms in 61% of sinuses. The presellar type (1.2%) was less common and sellar type (98.8%) being common in our population compared to the Caucasian and East Asian population. The sphenoid sinuses were extensively pneumatized in our population compared to the Chinese and Caucasian population, the prevalence being 76.6%, 68%, and 44.5% for clival; 59.7%, 46%, and 28.3% for lateral recess; 20.4%, 32%, and 12% for lesser wing extension, respectively. The pure forms were relatively less common and combined forms being more common compared to the Chinese and Caucasian population in our study.Conclusion:The extent of pneumatization of the sphenoid sinus has clinical and surgical implications in sellar and central skull base lesions, and variability in different populations confirms that ethnicity influences the differences in prevalence.

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“…In 1987, Teatini et al (11) showed a small gap in LP with no fat entrapment. Chow and Mafee (12) reported prolapse of medial rectus into the ethmoid cells.…”

Section: Discussionmentioning

confidence: 99%

“…Being aware of the dehiscence of LP is crucial before sinus surgery, since misdiagnosis may make perforation of orbital wall and damage the medial rectus and superior oblique hematoma and ocular infections (11,14).…”

Section: Discussionmentioning

confidence: 99%

Dehiscence of Lamina Papyracea a Normal Variation: A Case Report in Iran

Akbari

Alizade

2019

J Kermanshah Univ Med Sci

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Introduction: The dehiscence of lamina papyracea (LP) is an anatomic variation of ethmoid bone that is important in endoscopic sinus surgery. Case Presentation: There are two different cases without a history of trauma. Entrapment of fat was observed without the involvement of medial rectus muscle. The variations of paranasal sinuses are common, and certain types of them are very important; for instance, the position of LP, whether medial or lateral, or the dehiscence of LP therefore regarding the position of LP in sinus surgery can prevent complications of orbit. Conclusions: Awareness of dehiscence of LP before surgery is crucial for preventing orbital complications. The present study describes two cases with medial positions and dehiscence of LP.

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Computed Tomography of the Ethmoid Labyrinth and Adjacent Structures

Cited by 70 publications

References 20 publications

Anatomic Variation of Sphenoid Sinus and Related Structures in Libyan Population: CT Scan Study

Anatomic Variation of Sphenoid Sinus and Related Structures in Libyan Population: CT Scan Study

Assessment of variations in sphenoid sinus pneumatization in Indian population: A multidetector computed tomography study

Dehiscence of Lamina Papyracea a Normal Variation: A Case Report in Iran

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