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Folia Morphologica 2021The lateral (temporal) wall of the orbit separates it from the temporal fossa and the anterior part of the temporal muscle. Within this wall, the sphenozygomatic suture...
The lateral (temporal) wall of the orbit separates it from the temporal fossa and the anterior part of the temporal muscle. Within this wall, the sphenozygomatic suture joins the greater wing of the sphenoid bone and the zygomatic bone. We retrospectively documented in cone-beam computed tomography the anatomy of the orbit in a 56-year-old female and we found a previously unreported anatomic variant. The greater wing of the sphenoid bone and the zygomatic bone were separated, bilaterally, by a large unossified space which we termed the sphenozygomatic fissure. This was merged inferiorly with the inferior orbital fissure. A possible imbalanced mechanism of membranous ossification of both the zygomatic bone and the orbital surface of the greater wing could be speculated as a possible cause for such sphenozygomatic fissure. This previously undocumented anatomic variant is of high clinical relevance, since it may allow orbital fat to herniate (or bulge) toward the temporal fossa, it may be easily damaged during minor trauma and it should be carefully approached during the surgery of the orbit through the lateral wall.
Topics: Cone-Beam Computed Tomography; Female; Humans; Middle Aged; Orbit; Retrospective Studies; Sphenoid Bone
PubMed: 32073134
DOI: 10.5603/FM.a2020.0018 -
Anatomical Science International Jan 2018For a long time, because of its location at the skull base level, the sphenoid bone was rather mysterious as it was too difficult for anatomists to reach and to... (Review)
Review
For a long time, because of its location at the skull base level, the sphenoid bone was rather mysterious as it was too difficult for anatomists to reach and to elucidate its true configuration. The configuration of the sphenoid bone led to confusion regarding its sutures with the other skull bones, its shape, its detailed anatomy, and the vascular and nervous structures that cross it. This article takes the reader on a journey through time and space, charting the evolution of anatomists' comprehension of sphenoid bone morphology from antiquity to its conception as a bone structure in the eighteenth century, and ranging from ancient Greece to modern Italy and France. The journey illustrates that many anatomists have attempted to name and to best describe the structural elements of this polymorphous bone.
Topics: Humans; Sella Turcica; Skull Base; Sphenoid Bone
PubMed: 28349500
DOI: 10.1007/s12565-017-0399-5 -
Journal of Neuro-ophthalmology : the... Sep 2016We describe 2 unique cases of visual symptoms occurring during mastication in patients with lateral orbital wall defects. A 57-year-old man reported intermittent double...
We describe 2 unique cases of visual symptoms occurring during mastication in patients with lateral orbital wall defects. A 57-year-old man reported intermittent double vision and oscillopsia after a right fronto-temporal-orbito-zygomatic craniotomy with osteotomy of the lesser wing of the sphenoid for a complex invasive pituitary adenoma. Proptosis of the right globe was present only during mastication. Computed tomography (CT) revealed a bony defect in the right lateral orbital wall. A 48-year-old man presented with transient diplopia and scotoma in the right eye elicited by chewing. CT and magnetic resonance imaging demonstrated a bilobed lesion connecting the temporal fossa to the orbit through a defect in the right lateral orbital wall. The regional neuroanatomy and pathophysiology as pertaining to these cases are discussed.
Topics: Craniotomy; Diplopia; Exophthalmos; Humans; Magnetic Resonance Imaging; Male; Mastication; Middle Aged; Orbit; Postoperative Complications; Sphenoid Bone; Tomography, X-Ray Computed
PubMed: 26919071
DOI: 10.1097/WNO.0000000000000354 -
Folia Medica Cracoviensia 2019Authors paid attention to anatomy and clinical implications which are associated with the variations of the sphenoid sinus. We discuss also anatomical structure of the... (Review)
Review
Authors paid attention to anatomy and clinical implications which are associated with the variations of the sphenoid sinus. We discuss also anatomical structure of the sphenoid bone implementing clinical application of this bone to different invasive and miniinvasive procedures (i.e. FESS).
Topics: Endoscopy; Humans; Sphenoid Bone; Sphenoid Sinus; Tomography, X-Ray Computed
PubMed: 31659348
DOI: No ID Found -
Ugeskrift For Laeger Oct 2023In this case report a 54-year-old woman had an anterior clinoid process meningioma. She was initially diagnosed as having a cerebrovascular disease, however, her...
In this case report a 54-year-old woman had an anterior clinoid process meningioma. She was initially diagnosed as having a cerebrovascular disease, however, her stroke-like symptoms were most likely caused by internal carotid artery compression or vasospasm due to meningiomal involvement, but initially overlooked. Meningiomas are rarely reported as a cause of a stroke. A detailed evaluation can provide a high degree of confidence in differentiating stroke and non-stroke medical conditions, known as stroke mimics or chameleons, to be considered when a diagnosis of stroke has not been confirmed.
Topics: Humans; Female; Middle Aged; Meningioma; Stroke; Sphenoid Bone; Carotid Artery, Internal; Meningeal Neoplasms
PubMed: 37873985
DOI: No ID Found -
The Journal of Craniofacial SurgeryPneumatization variants of the temporal bone have a crucial importance in several surgical interventions. However, very few data are known about possible correlation...
Pneumatization variants of the temporal bone have a crucial importance in several surgical interventions. However, very few data are known about possible correlation with other pneumatization variants.Pneumatization of glenoid fossa, petrous apex, and infralabyrinthine portion of temporal bone was assessed in 200 computed tomography scans, equally divided between males and females (18-92 years). Pneumatization variants of the ethmoid (concha bullosa, agger nasi, pneumatized crista galli) and the sphenoid sinuses (pneumatized pterygoid processes, anterior clinoid processes, dorsum sellae, volume) were recorded as well.Differences in prevalence of each pneumatization type according to sex and side, among different portions of the temporal bone, and between temporal bone and the pneumatized variants of the ethmoid bone and sphenoid sinuses, were assessed through chi-square test (P < 0.05). Differences in sphenoid volume among different pneumatization degrees of the temporal bone were assessed through 1-way analysis of covariance test (P < 0.05).Pneumatization of the petrous apex and the infralabyrinthine portion was significantly more frequent in males than in females, whereas pneumatization of the glenoid fossa was more often observed on the right side (P < 0.05). Variants of the temporal bone are all related one with each other in males, whereas in females only the relationship between pneumatized petrous apex and infralabyrinthine portion was found. Moreover, in females the pneumatized petrous apex was related with pneumatized anterior clinoid process, and the pneumatized infralabyrinthine portion was related with the sphenoid sinus volume.Results may be useful for predicting these important variants in planning surgical interventions of the cranial base.
Topics: Ethmoid Bone; Female; Humans; Male; Petrous Bone; Sphenoid Bone; Sphenoid Sinus; Temporal Bone
PubMed: 34231515
DOI: 10.1097/SCS.0000000000007809 -
Swiss Dental Journal Mar 2020In this review about extraoral anatomy as depicted by cone beam computed tomography, the retromaxillary region is discussed. A medium-sized (6 x 6 cm) or large (≥ 8 x... (Review)
Review
In this review about extraoral anatomy as depicted by cone beam computed tomography, the retromaxillary region is discussed. A medium-sized (6 x 6 cm) or large (≥ 8 x 8 cm) field of view of the maxilla will inevitably depict the retromaxillary region that can be considered a «transition» zone between the viscerocranium and the neurocranium. Major structures of the region include the sphenoid bone and the pterygopalatine fossae. The sphenoid bone is a single but complex bone located between the maxilla and the brain. It is composed of a central body, bilateral greater and lesser wings, and pterygoid processes. Important neurovascular structures pass through the sphenoid bone: the optic nerve and the ophthalmic artery via the optic canal, the maxillary nerve via the foramen rotundum, and the pterygoid nerve via the Vidian canal. The central body of the sphenoid bone also contains the highly variable sphenoid sinus that is the most posteriorly located paranasal sinus. The bilateral pterygopalatine fossae behind the maxillary sinuses contain several important neurovascular structures that supply the maxilla and the midface.
Topics: Maxilla; Maxillary Sinus; Sphenoid Bone; Sphenoid Sinus; Spiral Cone-Beam Computed Tomography
PubMed: 32162855
DOI: No ID Found -
Folia Morphologica 2021Sphenoid sinuses are pneumatic spaces within the body of the sphenoid bone. Their development begins in the prenatal life and continues until the adulthood. Agenesis of...
BACKGROUND
Sphenoid sinuses are pneumatic spaces within the body of the sphenoid bone. Their development begins in the prenatal life and continues until the adulthood. Agenesis of the sphenoid sinuses is a situation in which they are undeveloped. On the other hand, a single sphenoid sinus lacks the presence of the main septum, leading to the formation of a single antrum. Contemporary use of transnasal transsphenoidal approaches for the pituitary surgery, as well as functional endoscopic sinus surgery urges medical professionals to be well acquainted with the aforementioned variant.
MATERIALS AND METHODS
Paranasal sinuses of 300 patients (150 females, 150 males) were evaluated using computed tomography, without the use of contrast medium. Inclusion criteria involved absence of any identifiable pathology within the sphenoid sinuses and age over 18 years. Subgroup analysis involved probing for potential sources of heterogeneity, namely gender.
RESULTS
In the whole research material of 300 patients, agenesis of the sphenoid sinuses was noted in 1% of the patients. No statistically significant differences were noted between the absence of the sphenoid sinuses and gender (p = 0.999). A single sphenoid sinus was found in 0.33% of the patients. There were no statistically significant differences found between the presence of fully developed sphenoid sinuses and gender (p = 0.498).
CONCLUSIONS
Both agenesis of the sphenoid sinuses and a single sphenoid sinus are rare anatomical variants. Adequate planning for transsphenoidal surgeries with preoperative medical imaging is of essence in order to perform a safe and quality procedure.
Topics: Adolescent; Adult; Anatomic Variation; Female; Humans; Male; Paranasal Sinuses; Sphenoid Bone; Sphenoid Sinus; Tomography, X-Ray Computed
PubMed: 34545557
DOI: 10.5603/FM.a2021.0092 -
Acta Clinica Croatica Feb 2022The sphenoid bone development occurs in both prenatal and postnatal periods. Sphenoid bone openings are used as surgical landmarks and are of great importance for...
The sphenoid bone development occurs in both prenatal and postnatal periods. Sphenoid bone openings are used as surgical landmarks and are of great importance for neurosurgeons in everyday practice. The aim of this study was to identify morphological characteristics, postnatal development and remodeling, as well as clinical aspect of the sphenoid bone openings and to investigate their relationship and difference in size. The macerated sphenoid bones analyzed in this study were scanned by micro-computed tomography. Areas and distance in-between foramen ovale and foramen rotundum were measured. In addition, different shapes of foramen ovale were described. The most common shape of foramen ovale on both sides was oval, followed by the round, almond and elongated shapes. Modest to strong positive correlations between all foramina and age for the whole sample and both subsamples were presented, except for the right foramen rotundum area in the male subsample, which did not show significant correlation with age. Our study revealed changes in postnatal development and anatomy of foramen ovale and foramen rotundum, primarily in the aspects of size and shape, and should contribute to reducing the risk of damage to neurovascular structures during surgical procedures.
Topics: Foramen Ovale; Humans; Male; Sphenoid Bone; Vitamins; X-Ray Microtomography
PubMed: 35282494
DOI: 10.20471/acc.2021.60.03.11 -
In Vivo (Athens, Greece) 2021Neurofibromatosis type 1 (NF1) is an autosomal dominant hereditary disease that causes tumors and many developmental disorders, e.g., cranial dysplasia. The purpose of...
BACKGROUND/AIM
Neurofibromatosis type 1 (NF1) is an autosomal dominant hereditary disease that causes tumors and many developmental disorders, e.g., cranial dysplasia. The purpose of this retrospective study was to analyse the pneumatisation of the sphenoid bone in NF1.
PATIENTS AND METHODS
The anonymised lateral cephalograms of 166 NF1 patients and 166 age- and sex-matched controls were examined for anterior-posterior sphenoid pneumatisation. The patient group analysis considered whether the patients had been affected by a facial plexiform neurofibroma (FPNF).
RESULTS
Sphenoid pneumatisation was significantly lower in NF1 patients than in controls [odds ratio (OR)=0.184; 95%CI=0.11-0.32; p<0.001]. A FPNF statistically significantly reduced sinus formation in patients (OR=0.38; p=0.002).
CONCLUSION
The condition 'NF1' has an effect on sphenoid pneumatisation. The findings are relevant for planning surgical procedures in this region and confirm current concepts to evaluate NF1 as a histogenesis control gene. The examination technique and basis of calculation presented here are easy-to-use and low-irradiation exposure instruments for screening for differences in sphenoid bone pneumatisation in defined populations.
Topics: Humans; Neurofibroma, Plexiform; Neurofibromatosis 1; Odds Ratio; Radiography; Retrospective Studies; Sphenoid Bone
PubMed: 33402484
DOI: 10.21873/invivo.12266