scholarly journals Anatomical variations of sphenoid sinus among patients undergoing computed tomography of paranasal sinus

2019 ◽  
Vol 5 (4) ◽  
pp. 888 ◽  
Author(s):  
Bhanu Pratap Singh ◽  
Rajendra Basayya Metgudmath ◽  
Divya Singh ◽  
Udit Saxena
Keyword(s):  
Computed Tomography ◽  
Optic Nerve ◽  
Carotid Artery ◽  
Internal Carotid Artery ◽  
Paranasal Sinus ◽  
Sphenoid Sinus ◽  
Internal Carotid ◽  
Three Dimensional ◽  
Maxillary Nerve ◽  
Vidian Nerve

<p class="abstract"><strong>Background:</strong> The approach to sphenoid sinus still remains a clinical challenge, despite the arrival of endoscopy, computed tomography (CT) and functional endoscopic sinus surgery (FESS). The complex and variable anatomy of the sphenoid sinus can be difficult to appreciate with standard axial or coronal CT images of the sinus. The study was done with the objective to study the anatomy of the sphenoid sinus and its variations, and to compare the prevalence of variants obtained in our study with the reported cases in the literature.</p><p class="abstract"><strong>Methods:</strong> The CT scans of 168 normal slides obtained from 84 patients with paranasal sinus were analysed using triplanar imaging provided by 64-slice spiral CT. The prevalence of each of the sphenoid sinus variation was also analysed.  </p><p class="abstract"><strong>Results:</strong> Results showed that the prevalence of pneumatization of the anterior clinoid process, greater wing of the sphenoid, and the pterygoid process was 17.85%, 22.61% and 32.14%, respectively. Protrusion of the internal carotid artery, optic nerve, maxillary nerve, and the vidian nerve was 47.61%, 36.90%, 25% and 26.19%, respectively. Dehiscence of internal carotid artery, optic nerve, maxillary nerve, and the vidian nerve was 30.95%, 29.76%, 14.28% and 22.61%, respectively. The prevalence of pneumatization in the Onodi cells was seen in 17.85% of the cases. Association of septa with an internal carotid artery was seen in 29.7% of the cases. Septa attachment to the optic nerve was also observed in 27.3% of the cases.</p><p class="abstract"><strong>Conclusions:</strong> The triplanar imaging (section thickness of 1 mm) is a better three-dimensional image of the sphenoid sinus, compared to coronal imaging. Triplanar imaging guides the surgical approach of the sphenoid sinus with mentally reconstructed three-dimensional images.</p><p class="abstract"> </p>

scholarly journals Assessment of Sphenoid Sinus Variations and Its Related Neurovascular Structures Using Contrasted Thin Slice Computed Tomography Scan Of The Brain

2018 ◽  
Vol 17 (1) ◽  
Author(s):  
Nawal Ahmed ◽  
Emad Nafie ◽  
Radhiana Hassan ◽  
Hafizah Binti Pasi
Keyword(s):  
Optic Nerve ◽  
Carotid Artery ◽  
Internal Carotid Artery ◽  
Sphenoid Sinus ◽  
Internal Carotid ◽  
Attachment Site ◽  
Anatomical Variations ◽  
Brain Scans ◽  
Neurovascular Structures ◽  
Tomography Scan

Introduction: Sphenoid sinus is the most variable structure in human. The prevalence of anatomical variations varies with the population. Increasing endoscopic procedures around the sphenoid sinus and advances in imaging techniques, allowed precise evaluation of sinus anatomical variation in each population. This study measured the prevalences and described the variations of the sphenoid sinus using thin slice contrasted computed tomography scan of brain scans. Materials and Methods: A retrospective cross-sectional study of 250 brain scans of patients between 18-60 years old attending Hospital Tengku Ampuan Afzan, Kuantan, Pahang from 1st January to 31st December 2017. The sphenoid sinus pneumatization types, volume, optic nerve relation according to Delano’s classification, internal carotid artery relation, and the number of sinus septum and attachment site were studied. Results: Post sellar pneumatization type was most common (52%). The mean sinus volume was 19 cm³ which was significantly different between genders. Delano optic nerve type 1 was most frequent (43%) and most were seen bilaterally with significant differences between gender. The internal carotid artery was seen non-protruded 41.6% cases, protruded in 36.4% cases, and protrusion with wall dehiscence in 22% cases. Two septate sinuses were more prominent (44.3%), aseptate sinus in 2.4% cases. The principle septa attachment site was sella (28%), internal carotid artery related septa found in 10% cases and 3.2% of cases with optic nerve septal attachment. Conclusion: This study revealed the presence of all sphenoid sinus variations amongst the study population. The preoperative determination of these anatomical variations minimizes vital neurovascular structures injury.

Relationship between sphenoid sinus volume and protrusion of internal carotid artery and optic nerve: a 3D segmentation study on maxillofacial CT-scans

2019 ◽  
Vol 41 (5) ◽  
pp. 507-512 ◽  
Author(s):  
Daniele Gibelli ◽  
Michaela Cellina ◽  
Stefano Gibelli ◽  
Annalisa Cappella ◽  
Antonio Giancarlo Oliva ◽  
...  
Keyword(s):  
Optic Nerve ◽  
Carotid Artery ◽  
Internal Carotid Artery ◽  
Sphenoid Sinus ◽  
Internal Carotid ◽  
Ct Scans ◽  
3D Segmentation

scholarly journals Association of accessory sphenoid septa with variations in neighbouring structures

2016 ◽  
Vol 131 (1) ◽  
pp. 51-55 ◽  
Author(s):  
F Aksoy ◽  
A Yenigun ◽  
S S Goktas ◽  
O Ozturan
Keyword(s):  
Computed Tomography ◽  
Optic Nerve ◽  
Carotid Artery ◽  
Internal Carotid Artery ◽  
Internal Carotid ◽  
Cross Sectional ◽  
Carotid Canal ◽  
Computed Tomography Images ◽  
Increased Risk ◽  
Internal Carotid Artery Injury

AbstractObjective:This study aimed to examine the relationship of the accessory sphenoidal septum with surrounding vital structures and their variations.Methods:This cross-sectional retrospective study investigated the prevalence of accessory sphenoidal septa and their relationship with variations in surrounding vital structures in coronal and axial paranasal computed tomography images.Results:Coronal and axial computed tomography images of 347 patients were assessed to evaluate the presence of accessory sphenoidal septa. Accessory sphenoidal septa originated from the internal carotid artery in 47.7 per cent of patients and from the optic nerve in 17.5 per cent. These structures were significantly associated with protrusion of the optic nerve, internal carotid canal or Vidian nerve canal.Conclusion:Accessory sphenoidal septa can originate from the internal carotid artery or the optic nerve. Therefore, the presence of an accessory sphenoidal septum indicates an increased risk of surgical complications including internal carotid artery injury and loss of vision due to optic nerve injury.

Three-dimensional Contrast Medium-enhanced Computed Tomographic Cisternography for Preoperative Evaluation of Surgical Anatomy of Intradural Paraclinoid Aneurysms of the Internal Carotid Artery: Technical Note

Neurosurgery ◽  
2002 ◽  
Vol 51 (4) ◽  
pp. 1089-1093 ◽  
Author(s):  
Kiyoshi Ito ◽  
Kazuhiro Hongo ◽  
Yukinari Kakizawa ◽  
Shigeaki Kobayashi
Keyword(s):  
Optic Nerve ◽  
Carotid Artery ◽  
Internal Carotid Artery ◽  
Contrast Medium ◽  
Internal Carotid ◽  
Preoperative Evaluation ◽  
Three Dimensional ◽  
Artery Aneurysm ◽  
Computed Tomographic ◽  
Paraclinoid Aneurysms

Abstract OBJECTIVE AND IMPORTANCE Precise preoperative evaluation is especially important when internal carotid artery aneurysms in the paraclinoid region are clipped, because these vascular structures are located in close proximity to various important structures such as the optic nerve and anterior clinoid process. We report a new method for “simultaneously” describing the interrelationships among the aneurysm, internal carotid artery, optic nerve, and bony structures with three-dimensional contrast medium-enhanced computed tomographic (3-D CMECT) cisternography. METHODS Informed consent was obtained from the patient. An 8-ml injection of iotrolan (Isovist; Schering, Berlin, Germany) (240 mg I/ml) was administered into the lumbar intrathecal space. A computed tomographic scan of the head was obtained 2 hours later with a multislice Asteion computed tomographic scanner (Toshiba, Inc., Tokyo, Japan). An Alatoview workstation (Silicon Graphics, Mountain View, CA) was used to reconstruct the three-dimensional images. RESULTS These images, as generated by 3-D CMECT cisternography, were found to accurately demonstrate the interrelationships of the internal carotid artery, aneurysm, and surrounding structures preoperatively. The findings obtained from these images proved to be quite similar to the intraoperative findings. 3-D CMECT cisternography clarified whether the paraclinoid aneurysm was intradural or extradural. CONCLUSION 3-D CMECT cisternography was found to provide a useful means for preoperative evaluation of lesions in the paraclinoid area.

scholarly journals Anatomical variations of the sphenoid sinus - a study of 200 cases -

2014 ◽  
Vol 20 (2) ◽  
pp. 57-62 ◽  
Author(s):  
M. Lupascu ◽  
Gh. I. Comsa ◽  
V. Zainea
Keyword(s):  
Optic Nerve ◽  
Carotid Artery ◽  
Internal Carotid Artery ◽  
Sphenoid Sinus ◽  
Internal Carotid ◽  
Anatomical Variation ◽  
Anatomical Variations ◽  
Vidian Canal ◽  
Foramen Rotundum ◽  
Sphenoid Sinuses

Abstract Our study on the anatomical variation of pneumatisation of the sphenoid sinuses was performed on 200 tomographical studies, evaluating the anatomical variations of the sphenoid sinuses and the Onodi cells, the types of pneumatisation according with the types described by Hammer and Radberg, as well as the extensions of pneumatisation towards the anterior clinoid processes, pterygoid processes and sphenoidal wings; the frequency of intrasphenoidal protrusions and dehiscences of internal carotid artery, optic nerve, Vidian canal and foramen rotundum and the presence of primary and secondary septa attached to their canals.

Surgical Anatomy and Variations of the Onodi Cell

1996 ◽  
Vol 10 (6) ◽  
pp. 365-372 ◽  
Author(s):  
Debra G. Weinberger ◽  
Vijay K. Anand ◽  
Mouwafak Al-Rawi ◽  
Han J. Cheng ◽  
Albert V. Messina
Keyword(s):  
Optic Nerve ◽  
Carotid Artery ◽  
Internal Carotid Artery ◽  
Endoscopic Sinus Surgery ◽  
Sphenoid Sinus ◽  
Internal Carotid ◽  
Surgical Anatomy ◽  
Sinus Surgery ◽  
Ct Scans ◽  
Onodi Cell

Onodi cells are posterior ethmoid cells superolateral to the sphenoid sinus that is intimately associated with the optic nerve. Embryologically, they are derived from ethmoid cells that have undergone dedifferentiation. The anatomic relationship of the Onodi cell to the optic nerve and the internal carotid artery has not been clearly documented in the literature. Forty-four sagittal sections of cadaver heads and 83 CT scans of the sinuses were examined. Case studies of three patients with Onodi cell sinusitis are presented. Two patients underwent endoscopic sinus surgery, and the other chose conservative medical management. The cadaver specimens revealed Onodi cells in 14% (6/44 sections). They were located lateral, superior, or superolateral to the sphenoid sinus. These relationships were further delineated by studying CT scans of the sinuses of 76 patients. Six patients (8%) had Onodi cells. Four of them had a dehiscence of the optic nerve adjacent to the Onodi cell. Twelve patients (16%) demonstrated a dehiscence of the internal carotid artery. These findings have important implications in endoscopic sinus surgery. The anatomic variability of the posterior ethmoids, sphenoid sinus, internal carotid artery, and optic nerve makes this surgical approach particularly challenging.

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