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Orbital apex

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https://www.readbyqxmd.com/read/28893971/computed-tomographic-assessment-of-equine-maxillary-cheek-teeth-anatomical-relationships-and-paranasal-sinus-volumes
#1
Tiziana Liuti, Richard Reardon, Paddy M Dixon
Disorders affecting the equine maxillary cheek teeth and paranasal sinuses are relatively common, but limited objective information is available on the dimensions and relationships of these structures in horses of different ages. The aims of this study were to assess age-related changes in the positioning and anatomical relationships of the individual maxillary cheek teeth with the infraorbital canal and maxillary septum and the volumes of the individual sinus compartments. CT and gross examination were performed on 60 normal equine cadaver heads that were aged by their dentition...
September 11, 2017: Veterinary Record
https://www.readbyqxmd.com/read/28875880/orbital-apex-syndrome-after-trauma-in-a-6-year-old-a-rare-occurrence
#2
A Ahmed
Orbital apex syndrome is rare, but can occur as a consequence of trauma from fracture of the medial orbit. This case report highlights the fact that a high index of suspicion is needed when a patient presents with a facial injury, especially in children who cannot give an account of the actual events that transpired. Radiological investigation should be done early when an underlying injury is suspected in a trauma patient. A low threshold for computed tomography should be maintained when proptosis and vision loss are present...
August 25, 2017: South African Medical Journal, Suid-Afrikaanse Tydskrif Vir Geneeskunde
https://www.readbyqxmd.com/read/28862553/transorbital-endoscopic-eyelid-approach-for-resection-of-sphenoorbital-meningiomas-with-predominant-hyperostosis-report-of-2-cases
#3
João Paulo Almeida, Sacit B Omay, Sathwik R Shetty, Yu-Ning Chen, Armando S Ruiz-Treviño, Buqing Liang, Vijay K Anand, Benjamin Levine, Theodore H Schwartz
Sphenoorbital meningiomas (SOMs) are slow-growing tumors that originate from the sphenoidal wing and are associated with visual deterioration, extrinsic ocular movement disorders, and proptosis caused by hyperostosis of the lateral wall of the orbit. In some cases, the intracranial component is quite small or "en plaque," and the majority of the symptoms arise from adjacent hyperostosis. Craniotomy has traditionally been the standard of care, but new minimally invasive multiportal endoscopic approaches offer an alternative...
September 1, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28845040/surgical-anatomy-for-the-endoscopic-endonasal-approach-to-the-ventrolateral-skull-base
#4
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/28814902/orbital-apex-cyst-a-rare-cause-of-compressive-optic-neuropathy-post-functional-endoscopic-sinus-surgery
#5
Yi Ni Koh, Shu Fen Ho, Letchumanan Pathma, Harvinder Singh, Embong Zunaina
There are various causes that can lead to compressive optic neuropathy. We present here orbital apex cyst as an unusual cause of compressive optic neuropathy in a 49-year-old male. He presented with 2 weeks painless loss of vision in the left eye with left-sided headache. He had had left functional endoscopic sinus surgery for left nasal polyps 4 years earlier. Magnetic resonance imaging of brain and orbit revealed a left discrete orbital nodule, possibly orbital cyst or mucocele, which was compressing on the left optic nerve...
2017: International Medical Case Reports Journal
https://www.readbyqxmd.com/read/28800388/rapid-access-to-nanographenes-and-fused-heteroaromatics-by-palladium-catalyzed-annulative-%C3%AF-extension-reaction-of-unfunctionalized-aromatics-with-diiodobiaryls
#6
Wataru Matsuoka, Hideto Ito, Kenichiro Itami
Efficient and rapid access to nanographenes and π-extended fused heteroaromatics is important in materials science. Here we report a Pd-catalyzed efficient one-step annulative π-extension (APEX) reaction of PAHs and heteroaromatics, producing various π-extended aromatics. In the presence of a cationic Pd complex, triflic acid, silver pivalate, and diiodobiaryls, diverse unfunctionalized PAHs and heteroaromatics were directly transformed into larger PAHs, nanographenes, and π-extended fused heteroaromatics in a single step...
August 11, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28718689/orbital-diffuse-large-b-cell-lymphoma-with-combined-variable-immunodeficiency
#7
Vishal S Parikh, Deepa Jagadeesh, James M Fernandez, Eric D Hsi, Arun D Singh
Common variable immunodeficiency (CVID) is a primary immunodeficiency manifesting as a reduction in the level of total immunoglobulin (Ig) G, a reduction in the level of either IgA or IgM, poor response to polysaccharide vaccine, and usually frequent infections. The association of CVID with an increased risk of malignancy, specifically lymphoma, is well known. A 63-year-old female with a past medical history significant for CVID presented with a 1-month history of dull, left eye pain with proptosis, hypoglobus, and left upper lid fullness without a discrete palpable mass...
July 18, 2017: Orbit
https://www.readbyqxmd.com/read/28658180/morphometric-analysis-of-the-orbital-process-of-the-palatine-bone-and-its-relationship-to-endoscopic-orbital-apex-surgery
#8
Sarina K Mueller, Suzanne K Freitag, Benjamin S Bleier
BACKGROUND: Endoscopic approaches to the orbit improve the ability to directly access apical lesions while minimizing manipulation of normal structures. Inferomedial orbital access is limited by the orbital process of the palatine bone (OPPB) which prevents dissection and retraction in the inferolateral vector. OBJECTIVE: The objective of this study was to examine the morphometric characteristics of the OPPB and quantify the benefit of complete resection to surgical access...
June 19, 2017: Ophthalmic Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28636148/magnetostructural-characterization-of-oxalamide-dihalo-bridged-copper-dimers-intra-and-interdimer-interactions-studied-by-single-crystal-electron-spin-resonance-spectroscopy
#9
Dijana Žilić, Debdeep Maity, Mario Cetina, Krešimir Molčanov, Zoran Džolić, Mirta Herak
Detailed single-crystal electron spin resonance (ESR) analysis of oxalamide complexes with halogen-bridged copper dimers, supported by X-ray, magnetic susceptibility, and powder ESR studies, is reported. Four complexes with two different ligands are synthesized: [CuL(A) (μ-X)]2 and [CuL(V) (μ-X)]2 , for which L(A) =N-(l-alanine methyl ester)-N'-[(2-pyridine-2-yl)methyl]oxalamide and L(V) =N-(l-valine methyl ester)-N'-[(2-pyridine-2-yl)methyl]oxalamide, for which X=Cl or Br. X-ray analysis shows that the geometry at each copper(II) ion is square pyramidal, whereas two pyramids share one base-to-apex edge with parallel basal planes...
June 21, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28622058/herpes-zoster-ophthalmicus-with-orbital-apex-syndrome-difference-in-outcomes-and-literature-review
#10
Jie Jie Lim, Yu Ming Ong, M Zain Wan Zalina, May May Choo
No abstract text is available yet for this article.
June 16, 2017: Ocular Immunology and Inflammation
https://www.readbyqxmd.com/read/28606263/-three-dimensional-vector-analysis-after-decompression-surgery-in-thyroid-associated-ophthalmopathy
#11
J Guo, J Qian, X F Li, F X Meng, R Q Ma
Objective: To analyze the change of globe position after different orbital decompression in thyroid-associated ophthalmopathy (TAO). Methods: It was a retrosective case series study. Twenty-nine TAO patients (33 eyes) underwent orbital decompression were collected between October 2014 and December 2016 at Eye & ENT Hospital of Fudan University. There were 17 males and 12 females, and the average age was 46 years (ranging from 21 to 66 years). Fifteen patients (17 eyes) underwent balanced decompression, 11 patients (11 eyes) underwent deep lateral decompression, and 4 patients (5 eyes) underwent medial decompression...
June 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
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
#12
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/28554552/orbital-and-orbitocranial-trauma-from-pencil-fragments-role-of-timely-diagnosis-and-management
#13
Won-Kyung Cho, Audrey C Ko, Habibullah Eatamadi, Abdelqadir Al-Ali, Jean-Paul Abboud, Don O Kikkawa, Bobby S Korn
PURPOSE: To emphasize the importance of early detection and radiologic evaluation of retained organic foreign bodies (FBs) in orbital or orbitocranial penetrating injuries by pencil. DESIGN: Retrospective case series. METHODS: A retrospective chart review of patients who had penetrating orbital or orbitocranial trauma at 2 tertiary hospitals was conducted. Patients whose mechanism of injury was penetrating trauma by pencil were included. The patients' demographics, time between initial trauma and detection of foreign body, radiologic images, and resulting sequelae were reviewed...
August 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28521351/the-endoscopic-endonasal-transmaxillary-approach-to-meckel-s-cave-through-the-inferior-orbital-fissure
#14
Xin Zhang, Halima Tabani, Ivan El-Sayed, Matthew Russell, Xuequan Feng, Arnau Benet
BACKGROUND: Surgical access to Meckel's Cave (MC) is challenging due to its deep location and surrounding important neurovascular structures. Currently existing endoscopic endonasal (EE) approaches require dissecting near the internal carotid artery (ICA) or require transposition of the pterygopalatine neurovascular bundle. OBJECTIVE: To describe a novel approach to access the anterolateral aspect of the MC using a minimally invasive EE route. METHODS: The EE transmaxillary transinferior orbital fissure approach was simulated in 10 specimens...
June 1, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28500433/the-effect-of-orbital-radiation-therapy-on-thyroid-associated-orbitopathy-complicated-with-dysthyroid-optic-neuropathy
#15
REVIEW
Yang Wang, Huifang Zhou, Xianqun Fan
Thyroid-associated orbitopathy (TAO) is an inflammatory autoimmune disorder. The most serious complication of TAO is dysthyroid optic neuropathy (DON), which can lead to permanent vision loss because of volume expansion in the orbital apex. Orbital radiation therapy (ORT) is an anti-inflammatory treatment used in the treatment of active TAO. Clinical studies support radiotherapy as having a modest effect on DON, and early radiotherapy may protect against disease progression to DON. Current studies suggest that radiotherapy is generally safe...
September 2017: Frontiers of Medicine
https://www.readbyqxmd.com/read/28417054/three-dimensional-and-topographic-relationships-between-the-orbital-margins-with-reference-to-assessment-of-eyeball-protrusion
#16
Kang-Jae Shin, Shin-Hyo Lee, Ki-Seok Koh, Wu-Chul Song
This study investigated the topographic relationships among the eyeball and four orbital margins with the aim of identifying the correlation between orbital geometry and eyeball protrusion in Koreans. Three-dimensional (3D) volume rendering of the face was performed using serial computed-tomography images of 141 Koreans, and several landmarks on the bony orbit and the cornea were directly marked on the 3D volumes. The anterior-posterior distances from the apex of the cornea to each orbital margin and between the orbital margins were measured in both eyes...
March 2017: Anatomy & Cell Biology
https://www.readbyqxmd.com/read/28416422/-penetrating-air-gun-pellet-into-the-orbital-apex
#17
Rodolfo Belmonte-Caro, Alberto Garcia-Perla-Garcia, Jose Romero-Arce, Pedro Infante-Cossio
A foreign body penetrating into the intraconal orbital compartment poses a surgical challenge because of its deep location behind the globe and near the optic nerve. We present a case of an air gun pellet lodged into the orbital apex, which was removed via superolateral orbitotomy through coronal incision. This additional craniofacial technique is a safe procedure to access the lateral aspect of the intraconal compartment in the unusual event of having to remove an orbital foreign body.
April 14, 2017: Neurocirugía
https://www.readbyqxmd.com/read/28390122/orbital-apex-syndrome-affecting-head-and-neck-cancer-patients-a-case-series
#18
A-C Prado-Ribeiro, A-C Luiz, M-A Montezuma, M-P Mak, A-R Santos-Silva, T-B Brandão
BACKGROUND: Orbital apex syndrome (OAS) is a complex and uncommon disorder that typically damages multiple cranial nerves in association with optic nerve dysfunction. OAS is associated with several different pathologies, however; only a few cases have been reported in association with head and neck cancer (HNC) so far. MATERIAL AND METHODS: A case series of HNC patients diagnosed with OAS is described including clinicopathological data, image findings, and disease outcome...
May 1, 2017: Medicina Oral, Patología Oral y Cirugía Bucal
https://www.readbyqxmd.com/read/28372859/the-wedge-sign-an-imaging-sign-for-aggressive-lacrimal-gland-disease
#19
RANDOMIZED CONTROLLED TRIAL
Daniele Lorenzano, Geoffrey E Rose
PURPOSE: Lacrimal gland carcinoma can form a triangle of tissue back to the orbital apex, intraconal spread apparently being prevented by the intermuscular septum. The "wedge sign" frequency is assessed in lacrimal carcinoma, lacrimal lymphoma, or dacryoadenitis. DESIGN: Retrospective masked review of images from patients with biopsy-proven lacrimal gland pathology. METHODS: For each patient, the presence of a triangle of tissue between the lateral rectus and lateral orbital wall and the superior rectus and the orbital roof was assessed by masked review of computed tomography or magnetic resonance imaging...
July 2017: Ophthalmology
https://www.readbyqxmd.com/read/28348632/primary-ocular-adnexal-extranodal-marginal-zone-mucosa-associated-lymphoid-tissue-malt-lymphoma-presenting-as-orbital-apex-syndrome
#20
Carlen A Yuen, John H Pula, Milap Mehta
A 75-year-old female with a past medical history significant for prior stroke and atrial fibrillation presented with acute onset of orbital apex syndrome with chemosis and periorbital ecchymosis. Following initial treatment to relieve intraocular pressure, she began spontaneously haemorrhaging retro-orbitally. Preliminary investigation with neuroimaging demonstrated a left orbital mass with extension into the orbital apex. A provisional diagnosis of cavernous haemangioma was made. She was treated with transorbital resection of the orbital mass...
April 2017: Neuro-ophthalmology
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