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endoscopic skull base anatomy

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https://www.readbyqxmd.com/read/28931257/morphometric-analysis-of-the-middle-clinoid-process-using-maxillofacial-computed-tomography-scans
#1
Christopher Miller, Roukoz Chamoun, David Beahm
BACKGROUND: The interest in detailed anatomy of the sella and parasellar regions has resurged recently due to the wide clinical applications of the expanded endoscopic approaches to the skull base. The middle clinoid process (MCP) is a bony structure that can affect wide endoscopic exposure of the sella and parasellar region. OBJECTIVE: To study and analyze the anatomic variations of the MCP in the general population using computed tomography scans. METHODS: A total of 150 maxillofacial computed tomography scans were reviewed to characterize the MCP...
February 1, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28881251/registration-and-fusion-quantification-of-augmented-reality-based-nasal-endoscopic-surgery
#2
Yakui Chu, Jian Yang, Shaodong Ma, Danni Ai, Wenjie Li, Hong Song, Liang Li, Duanduan Chen, Lei Chen, Yongtian Wang
This paper quantifies the registration and fusion display errors of augmented reality-based nasal endoscopic surgery (ARNES). We comparatively investigated the spatial calibration process for front-end endoscopy and redefined the accuracy level of a calibrated endoscope by using a calibration tool with improved structural reliability. We also studied how registration accuracy was combined with the number and distribution of the deployed fiducial points (FPs) for positioning and the measured registration time...
August 3, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28845040/surgical-anatomy-for-the-endoscopic-endonasal-approach-to-the-ventrolateral-skull-base
#3
Kenichi Oyama, Shigeyuki Tahara, Toshio Hirohata, Yudo Ishii, Daniel M Prevedello, Ricardo L Carrau, Sebastien Froelich, Akira Teramoto, Akio Morita, Akira Matsuno
The authors describe the surgical anatomy for the endoscopic endonasal approach (EEA) to the ventrolateral skull base. The ventrolateral skull base can be divided into two segments: the upper lateral and lower lateral skull base. The upper lateral skull base includes the cavernous sinus and the orbit, while the lower lateral skull base includes the petrous apex, Meckel's cave, parapharyngeal space, infratemporal fossa, etc. To gain access to the upper lateral skull base, a simple opening of the ethmoid sinus provides sufficient exposure of this area...
August 25, 2017: Neurologia Medico-chirurgica
https://www.readbyqxmd.com/read/28838118/efficacy-of-endoscopic-fluorescein-video-angiography-in-aneurysm-surgery-novel-and-innovative-assessment-of-vascular-blood-flow-in-the-dead-angles-of-the-microscope
#4
Koji Hashimoto, Hiroyuki Kinouchi, Hideyuki Yoshioka, Kazuya Kanemaru, Masakazu Ogiwara, Takashi Yagi, Takuma Wakai, Yuichiro Fukumoto
BACKGROUND: In aneurysm surgery, assessment of the blood flow around the aneurysm is crucial. Recently, intraoperative fluorescence video angiography has been widely adopted for this purpose. However, the observation field of this procedure is limited to the microscopic view, and it is difficult to visualize blood flow obscured by the skull base anatomy, parent arteries, and aneurysm. OBJECTIVE: To demonstrate the efficacy of a new small-caliber endoscopic fluorescence video angiography system employing sodium fluorescein in aneurysm surgery for the first time...
August 1, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28838109/endoscopic-endonasal-interdural-middle-fossa-approach-to-the-maxillary-nerve-anatomic-considerations-and-surgical-relevance
#5
Kumar Abhinav, David Panczykowski, Wei-Hsin Wang, Carl H Synderman, Paul A Gardner, Eric W Wang, Juan C Fernandez-Miranda
BACKGROUND: The maxillary nerve (V2) can be approached via the open middle fossa approach. OBJECTIVE: To delineate the anatomy of V2 and its specific segments with respect to the endonasal landmarks. We present the endoscopic endonasal interdural middle fossa approach to V2 and its potential application for the treatment of perineural spread in sinonasal/skull base tumors. METHODS: Five human head silicon-injected specimens underwent bilateral endoscopic endonasal transpterygoid approaches...
August 1, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28808799/transorbital-endoscopic-approach-for-exposure-of-the-sylvian-fissure-middle-cerebral-artery-and-crural-cistern-an-anatomical-study
#6
João Paulo Almeida, Armando S Ruiz-Treviño, Sathwik R Shetty, Sacit B Omay, Vijay K Anand, Theodore H Schwartz
BACKGROUND: The availability of minimal access instrumentation and endoscopic visualization has revolutionized the field of minimally invasive skull base surgery. The transorbital endoscopic approach using an eyelid incision has been proposed as a new minimally invasive technique for the treatment of skull base pathology, mostly extradural tumors. Our study aims to evaluate the anatomical aspects and potential role of the transorbital endoscopic approach for exposure of the sylvian fissure, middle cerebral artery and crural cistern...
August 14, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28799880/a-morphometric-survey-of-the-parasellar-region-in-more-than-2700-skulls-emphasis-on-the-middle-clinoid-process-variants-and-implications-in-endoscopic-and-microsurgical-approaches
#7
Akshay Sharma, Gabrielle E Rieth, Joseph E Tanenbaum, James S Williams, Nakao Ota, Srikant Chakravarthi, Sunil Manjila, Amin Kassam, Bulent Yapicilar
OBJECTIVE The middle clinoid process (MCP) is a bony projection that extends from the sphenoid bone near the lateral margin of the sella turcica. The varied prevalence and morphological features of the MCP in populations stratified by age, race, and sex are unknown; however, the knowledge of its anatomy and preoperative recognition on CT scans can aid greatly in complication avoidance and management. The aim of this study was to further illustrate the surgical anatomy of the parasellar region and to quantify the incidence of MCP and caroticoclinoid rings (CCRs) in dried preserved human anatomical specimens...
August 11, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28603682/an-automated-methodology-for-assessing-anatomy-specific-instrument-motion-during-endoscopic-endonasal-skull-base-surgery
#8
R Alex Harbison, Yangming Li, Angelique M Berens, Randall A Bly, Blake Hannaford, Kris S Moe
Objectives  Describe instrument motion during live endoscopic skull base surgery (ESBS) and evaluate kinematics within anatomic regions. Design  Case series. Setting  Tertiary academic center. Participants  A single skull base surgeon performed six anterior skull base approaches to the pituitary. Main Outcomes and Measures  Time-stamped instrument coordinates were recorded using an optical tracking system. Kinematics (i.e., mean cumulative instrument travel, velocity, acceleration, and angular velocity) was calculated by anatomic region including nasal vestibule, anterior and posterior ethmoid, sphenoid, and lateral opticocarotid recess (lOCR) regions...
June 2017: Journal of Neurological Surgery. Part B, Skull Base
https://www.readbyqxmd.com/read/28593110/endoscopic-endonasal-transclival-approach-versus-dual-transorbital-port-technique-for-clip-application-to-the-posterior-circulation-a-cadaveric-anatomical-and-cerebral-circulation-simulation-study
#9
Jeremy N Ciporen, Brandon Lucke-Wold, Aclan Dogan, Justin Cetas, William Cameron
Purpose  Simulation training offers a useful opportunity to appreciate vascular anatomy and develop the technical expertise required to clip intracranial aneurysms of the posterior circulation. Materials and Methods  In cadavers, a comparison was made between the endoscopic transclival approach (ETA) alone and a combined multiportal approach using the ETA and a transorbital precaruncular approach (TOPA) to evaluate degrees of freedom, angles of visualization, and ergonomics of aneurysm clip application to the posterior circulation depending on basilar apex position relative to the posterior clinoids...
June 2017: Journal of Neurological Surgery. Part B, Skull Base
https://www.readbyqxmd.com/read/28583236/complete-response-of-skull-base-inverted-papilloma-to-chemotherapy-case-report
#10
Edward C Kuan, John W Frederick, Miguel F Palma Diaz, Dean W Lim, Jeffrey D Suh
BACKGROUND: Inverted papilloma (IP) is the most common benign sinonasal neoplasm. Endoscopic techniques, improved understanding of pathophysiology, and novel surgical approaches have allowed rhinologists to treat IPs more effectively, with surgery being the mainstay of therapy. Frontal sinus IP poses a challenge for surgical therapy due to complex anatomy and potentially difficult surgical access. OBJECTIVES: We reported a unique case of a massive frontal sinus IP that presented with intracranial and orbital extension, with near resolution after chemotherapy...
June 1, 2017: Allergy & Rhinology
https://www.readbyqxmd.com/read/28512043/endoscopic-assisted-supraorbital-keyhole-approach-or-endoscopic-endonasal-approach-in-cases-of-tuberculum-sellae-meningioma-which-surgical-route-should-be-favored
#11
Stefan Linsler, Gerrit Fischer, Volodymyr Skliarenko, Axel Stadie, Joachim Oertel
OBJECTIVE: Keyhole approaches are under investigation for skull base tumor surgery. They are expected to have a low complication rate with the same successful resection rate compared with endoscopic endonasal procedures. In this study, we compare our current series of tuberculum sellae meningiomas resected via an endoscopic endonasal or microsurgical supraorbital keyhole approach. METHODS: Between 2011 and 2016, 16 patients were treated using the supraorbital keyhole procedure and 6 patients received an endoscopic endonasal procedure...
August 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28490402/international-frontal-sinus-anatomy-classification-and-anatomic-predictors-of-low-lying-anterior-ethmoidal-arteries
#12
Phayvanh P Sjogren, Rajendra Waghela, Shaelene Ashby, Richard H Wiggins, Richard R Orlandi, Jeremiah A Alt
BACKGROUND: The International Frontal Sinus Anatomy Classification (IFAC) was introduced to more accurately characterize ethmoid and frontal sinus pneumatization patterns. The prevalence of IFAC cells and their anatomic associations have not been described. OBJECTIVE: The goal was to examine the prevalence of IFAC cells and determine radiologic features associated with a low-lying anterior ethmoidal artery (LAEA). METHODS: Imaging of adult patients who underwent computed tomographies from January 2015 to March 2016 were retrospectively reviewed by using the IFAC classification...
May 1, 2017: American Journal of Rhinology & Allergy
https://www.readbyqxmd.com/read/28468205/a-rare-concha-variation-coronal-cleft
#13
Serap Yucel, Hediye Pinar Gunbey, Emre Gunbey, Asli Tanrivermis Sayit, Kerim Aslan
Nasal turbinates are embryologically derived from a series of outgrowths from the foetal lateral nasal wall. These outgrowths form a series of ridges, referred to as "ethmoturbinals" and have several vital functions. Several different turbinate variations have been reported so far. The authors presented 3 patients of coronal clefted concha who were diagnosed with magnetic resonance imaging. Computed tomography scans and nasal endoscopic examinations are also performed subsequently. These patients are the first coronal clefted concha cases in the literature and also the first radiological study defining concha cleft...
May 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28392037/next-generation-surgical-navigation-systems-in-sinus-and-skull-base-surgery
#14
REVIEW
Martin J Citardi, William Yao, Amber Luong
Over the past 25 years, rhinologists have adopted surgical navigation technology for endoscopic sinus and skull base procedures. Navigation systems often produce a wide target registration error (TRE). Ideally, next-generation systems will include a leap in target registration error reduce TRE through innovative hardware and software. Incorporation of microsensors will be another important innovation. Future systems are likely to include augmented reality, which can project overlays of critical anatomy on real-world endoscopic images...
June 2017: Otolaryngologic Clinics of North America
https://www.readbyqxmd.com/read/28359922/first-application-of-7-t-magnetic-resonance-imaging-in-endoscopic-endonasal-surgery-of-skull-base-tumors
#15
Thomas F Barrett, Hadrien A Dyvorne, Francesco Padormo, Puneet S Pawha, Bradley N Delman, Raj K Shrivastava, Priti Balchandani
BACKGROUND: Successful endoscopic endonasal surgery for the resection of skull base tumors is reliant on preoperative imaging to delineate pathology from the surrounding anatomy. The increased signal-to-noise ratio afforded by 7-T MRI can be used to increase spatial and contrast resolution, which may lend itself to improved imaging of the skull base. In this study, we apply a 7-T imaging protocol to patients with skull base tumors and compare the images with clinical standard of care...
July 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28293965/endoscopic-approach-for-a-delayed-post-traumatic-ethmoidal-mucocele-a-technical-note
#16
Mahmoud Messerer, Giulia Cossu, Roy Thomas Daniel
OBJECTIVE: Delayed post-traumatic mucoceles are rare. We describe the surgical treatment of a post-traumatic ethmoidal mucocele with intra-orbital extension. METHOD: A uninostril endoscopic endonasal approach (EEA) was performed. The access was contralateral to the lesion to provide a wider lateral view. After a large sphenoid and ethmoid sinuses opening, the collection was drained and the optic nerve precociously identified. The orbital roof was eroded and the frontal dura mater directly visible...
March 15, 2017: British Journal of Neurosurgery
https://www.readbyqxmd.com/read/28118191/a-rare-concha-variation-coronal-cleft
#17
Serap Yucel, Hediye Pinar Gunbey, Emre Gunbey, Asli Sayit Tanrivermis, Kerim Aslan
Nasal turbinates are embryologically derived from a series of outgrowths from the foetal lateral nasal wall. These outgrowths form a series of ridges, referred to as "ethmoturbinals" and have several vital functions. Several different turbinate variations have been reported so far. The authors presented 3 patients of coronal clefted concha who were diagnosed with magnetic resonance imaging. Computed tomography scans and nasal endoscopic examinations are also performed subsequently. These patients are the first coronal clefted concha cases in the literature and also the first radiological study defining concha cleft...
January 23, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/27906848/calculation-of-an-optic-nerve-injury-risk-profile-before-sphenoid-sinus-surgery
#18
Erdem Atalay Cetinkaya, Koray Koc, Mehmet Fatih Kucuk, Pinar Koc, Nuray Bayar Muluk, Cemal Cingi
OBJECTIVES: Our objective was to analyze variations in the optic nerve (ON) course and surrounding structures in an effort to construct an optic nerve injury risk profile before endoscopic intranasal sphenoidal, or endoscopic endonasal transphenoidal, skull-base surgery, and eventually to construct and formulate a common classification by combining the known classes. The authors used computed tomography (CT) toward this end. METHODS: The authors retrospectively reviewed 200 consecutive CT scans (400 sides) of the paranasal sinuses...
January 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/27890187/imaging-of-paranasal-sinuses-and-anterior-skull-base-and-relevant-anatomic-variations
#19
REVIEW
Estushi Iida, Yoshimi Anzai
This article reviews the normal anatomy and variants of the anterior skull base and sinonasal cavities that are relevant to endoscopic sinus and skull base surgery. Radiologists should be aware of sinonasal anatomy that can be impediments to surgical access and increase risk of vascular or cranial nerve injury during surgery. Imaging features of the paranasal sinuses and anterior skull base pathologies are also discussed.
January 2017: Radiologic Clinics of North America
https://www.readbyqxmd.com/read/27767395/endoscopic-endonasal-transclival-resection-of-a-ventral-pontine-cavernous-malformation-technical-case-report
#20
Juan Luis Gómez-Amador, Luis Alberto Ortega-Porcayo, Isaac Jair Palacios-Ortíz, Alexander Perdomo-Pantoja, Felipe Eduardo Nares-López, Alfredo Vega-Alarcón
Brainstem cavernous malformations are challenging due to the critical anatomy and potential surgical risks. Anterolateral, lateral, and dorsal surgical approaches provide limited ventral exposure of the brainstem. The authors present a case of a midline ventral pontine cavernous malformation resected through an endoscopic endonasal transclival approach based on minimal brainstem transection, negligible cranial nerve manipulation, and a straightforward trajectory. Technical and reconstruction technique advances in endoscopic endonasal skull base surgery provide a direct, safe, and effective corridor to the brainstem...
October 21, 2016: Journal of Neurosurgery
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