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orbital reconstruction

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https://www.readbyqxmd.com/read/29775558/reconstructing-a-traumatic-empty-orbit-principles-difficulties-of-treatment-and-literature-review
#1
REVIEW
Panagiotis Stathopoulos, Philip Ameerally
PURPOSE: This report describes the case of a serious orbital injury in which the globe was completely displaced into the nasal cavity and the orbit was clinically empty. The authors discuss the difficulties encountered in the management of this patient and their principles in the reconstruction of a complex defect. MATERIALS AND METHODS: In this rare case of severe injury, the authors used a combined transconjunctival and ethmoidal approach to retrieve the displaced globe from the nasal cavity...
April 21, 2018: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29771884/-exophthalmometry-with-computed-tomography
#2
M B Gushchina, D S Afanasyeva, S A Borzenok
Bone abnormalities of orbit seen in patients with trauma or radiolesion are accompanied by enophthalmos or exophthalmos. Conventional measurements of eyeball protrusion with Hertel's exophthalmometer or with computed tomography do not provide accurate and reliable data, especially in patients with asymmetry of lateral orbital rims. PURPOSE: To develop a method of computed exophthalmometry that provides accurate and reliable measurements in patients with various orbital conditions. MATERIAL AND METHODS: Medical records and computerized axial tomography scans of 25 patients' orbits without false enophthalmos or exophthalmos were analyzed posthoc...
2018: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/29771840/combined-access-for-the-treatment-of-medial-orbital-wall-fracture-subciliary-and-upper-eyelid-sulcus-incisions
#3
Mariana Alcantara Rodrigues de Moraes, João Pedro Rocha Biló, Max Domingues Pereira
The present study presents a new surgical approach to treat medial orbital wall fractures, that is, the combined transcutaneous access through subciliary and upper eyelid sulcus incisions. The study performed the retrospective analysis of medical records belonging to 14 consecutive patients with medial orbital wall fracture, who were treated in the Plastic Surgery Division at Federal University of São Paulo, from 2005 to 2013, through the combination of subciliary and upper eyelid sulcus incisions to access the fracture foci...
May 15, 2018: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29771829/repairing-a-facial-cleft-by-polyether-ether-ketone-implant-combined-with-titanium-mesh
#4
Yuan Deng, Weiwei Tang, Zhengkang Li
The Tessier Number 4 cleft is one of the rarest, most complex craniofacial anomalies that presents difficulties in surgical treatment. In this article, we report a case of simultaneous facial depression, eye displacement, and medial canthus deformity. In this case, the maxillary bony defect was reconstructed using computer-assisted design computer-assisted manufacturing (CAD-CAM) polyether-ether-ketone (PEEK) material, and the orbital floor defect was repaired with AO prefabricated titanium mesh. Additionally, the medial canthus was modified with canthopexy and a single Z-plasty flap...
May 15, 2018: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29765948/congenital-orbital-rhabdomyosarcoma
#5
Masoomeh Eghtedari, Amir Reza Farsiani, Mohammad Reza Bordbar
Rhabdomyosarcoma (RMS) is the most common malignant tumor of the orbit in children, but it is rarely present at birth. We report a large congenital orbital RMS with intracranial extension in a newborn baby. A newborn baby girl was referred to our hospital due to severe right-eye exophthalmia. Imaging studies showed an orbital mass with intracranial extension. Treatment was started with a course of neoadjuvant chemotherapy followed by right orbital exenteration and intracranial resection of the tumor. Histologic examination of the mass showed undifferentiated malignant small-cell tumor...
April 2018: Ocular Oncology and Pathology
https://www.readbyqxmd.com/read/29765272/approach-to-reconstruction-of-cheek-defects
#6
REVIEW
Berkay Başağaoğlu, Mohin Bhadkamkar, Pierce Hollier, Edward Reece
The cheek is the largest facial unit with a prominent position on the face. Trauma, burns, and the resection of skin cancers constitute common sources of injury, potentially resulting in defects that, through natural healing, produce noticeable scarring. Surgical repair focuses on the reformation of three-dimensional geometries, proper establishment of symmetry, and the minimization of color and texture discrepancies to the surrounding. Defects located in this region may extend to the orbital, nasal, or buccal units and cause unique structural and functional disturbances...
May 2018: Seminars in Plastic Surgery
https://www.readbyqxmd.com/read/29765023/symmetry-mismatch-driven-perpendicular-magnetic-anisotropy-for-perovskite-brownmillerite-heterostructures
#7
Jing Zhang, Zhicheng Zhong, Xiangxiang Guan, Xi Shen, Jine Zhang, Furong Han, Hui Zhang, Hongrui Zhang, Xi Yan, Qinghua Zhang, Lin Gu, Fengxia Hu, Richeng Yu, Baogen Shen, Jirong Sun
Grouping different transition metal oxides together by interface engineering is an important route toward emergent phenomenon. While most of the previous works focused on the interface effects in perovskite/perovskite heterostructures, here we reported on a symmetry mismatch-driven spin reorientation toward perpendicular magnetic anisotropy in perovskite/brownmillerite heterostructures, which is scarcely seen in tensile perovskite/perovskite heterostructures. We show that alternately stacking perovskite La2/3 Sr1/3 MnO3 and brownmillerite LaCoO2...
May 15, 2018: Nature Communications
https://www.readbyqxmd.com/read/29762326/temporal-progression-of-craniofacial-dysmorphology-in-unilateral-coronal-synostosis-a-mechanistic-hypothesis
#8
Kirun Baweja, Alexander H Sun, Rajendra Sawh-Martinez, John A Persing
AIM: This study chronicles skull base and face development in nonsyndromic unilateral coronal synostosis (UCS) during infancy, to characterize the mechanistic progression of facial dysmorphology. METHODS: Computed tomography scans from 51 subjects were reviewed (26 UCS, 25 controls) and data were reconstructed. Patients were stratified into 5 age groups. A series of measurements were taken from the reconstructions. RESULTS: All patients had a unilaterally fused coronal suture at the time of analysis...
May 14, 2018: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29759951/immediate-and-long-term-results-of-unsintered-hydroxyapatite-and-poly-l-lactide-composite-sheets-for-orbital-wall-fracture-reconstruction
#9
Keishi Kohyama, Yoko Morishima, Koki Arisawa, Yuko Arisawa, Hisakazu Kato
INTRODUCTION: Bone defect reconstruction in orbital wall fractures with absorbable alloplastic such as the unsintered hydroxyapatite and poly L-lactide composite (u-HA/PLLA) system is gaining popularity. The u-HA/PLLA material has osteoconductive and osteosynthetic properties. However, quantitative, long-term outcome data after the use of u-HA/PLLA for orbital wall fractures are lacking. PATIENTS AND METHODS: We retrospectively analyzed 115 patients who underwent surgical repair of orbital wall fractures with a u-HA/PLLA sheet from 2011 to 2016...
March 28, 2018: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
https://www.readbyqxmd.com/read/29742577/surgical-management-of-the-recent-orbital-war-injury
#10
Safaa Riyadh, Saif Saadedeen Abdulrazaq, Ali Mhana Sabeeh Zirjawi
Maxillofacial trauma affects sensitive and essential functions for the human being such as smell, breathing, talking, and the most importantly the sight. Trauma to the orbit may cause a vision loss especially if this trauma yields a high kinetic energy like that encountered during wars. The purpose of the study was to evaluate the surgical outcomes of the orbital war trauma, enriching the literature with the experience of the authors in this field. A total of 16 patients were injured, evacuated, and managed, between June 2014 and June 2017, from the fight between the Iraqi army and the Islamic State of Iraq and Syria (ISIS) in different areas of Iraq...
May 8, 2018: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29738747/orbital-reconstruction-by-patient-specific-implant-printed-in-porous-titanium-a-retrospective-case-series-of-12-patients
#11
Jean-Thomas Bachelet, Guillaume Cordier, Matthieu Porcheray, Jerome Bourlet, Arnaud Gleizal, Jean-Marc Foletti
PURPOSE: The purpose of this study was to evaluate the orbital patient-specific implant (PSI) directly printed in porous titanium for the reconstruction of complex orbital bone defects in a series of 12 patients. PATIENTS AND METHODS: The authors designed and implemented a case series. The sample consisted of patients with unilateral complex orbital bone loss. All patients received a porous titanium PSI designed from the healthy contralateral side (mirroring). The criteria analyzed were the functional results: correction of enophthalmos, correction of ocular motility, operative time, complications, and operative revisions...
April 12, 2018: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29732952/clinical-comparison-of-scapular-fibular-and-iliac-crest-osseal-free-flaps-in-maxillofacial-reconstructions
#12
T Wilkman, A Husso, P Lassus
BACKGROUND AND AIMS: This study compared the three most used composite flaps in maxillofacial reconstructions in our institute. PATIENTS AND METHODS: Between 2000 and 2012, a total of 163 patients with mandibular, maxillary, and orbital defects received either scapular, fibular, or iliac crest osseal reconstructions in Helsinki University Hospital, Departments of Plastic Surgery and Maxillofacial Surgery. Data regarding the patient demographics, complications, and outcomes were analyzed...
May 1, 2018: Scandinavian Journal of Surgery: SJS
https://www.readbyqxmd.com/read/29728627/orbital-scale-denitrification-changes-in-the-eastern-arabian-sea-during-the-last-800-kyrs
#13
Ji-Eun Kim, Boo-Keun Khim, Minoru Ikehara, Jongmin Lee
Denitrification in the Arabian Sea is closely related to the monsoon-induced upwelling and subsequent phytoplankton production in the surface water. The δ15 N values of bulk sediments collected at Site U1456 of the International Ocean Discovery Program (IODP) Expedition 355 reveal the orbital-scale denitrification history in response to the Indian Monsoon. Age reconstruction based on the correlation of planktonic foraminifera (Globigerinoides ruber) δ18 O values with the LR04 stack together with the shipboard biostratigraphic and paleomagnetic data assigns the study interval to be 1...
May 4, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29723950/use-of-a-contralateral-nasoseptal-flap-for-sino-orbital-fistula-closure
#14
Mohammad K Hararah, Jameson K Mattingly, Vijay R Ramakrishnan
Sino-orbital fistulas can occur after orbital exenteration. Chronic nonhealing fistulas lead to bothersome symptoms including malodorous discharge, hypernasal speech, crusting, wound breakdown, or inability to wear an ocular prosthesis. Reconstruction can be difficult due to the complexity of the defects and the multitude of treatments patients often undergo for the management of the primary disease. Prior radiation, lack of available local tissue, or compromised blood supply are some of the issues that make successful fistula closure problematic...
May 2018: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29719502/human-thalamic-prefrontal-peduncle-connectivity-revealed-by-diffusion-spectrum-imaging-fiber-tracking
#15
Chuanqi Sun, Yibao Wang, Run Cui, Chong Wu, Xinguo Li, Yue Bao, Yong Wang
The thalamic-prefrontal peduncle (TPP) is a large bundle connecting the thalamus and prefrontal cortex. The definitive structure and function of the TPP are still controversial. To investigate the connectivity and segmentation patterns of the TPP, we employed diffusion spectrum imaging with generalized q-sampling reconstruction to perform both subject-specific and template-based analyses. Our results confirmed the trajectory and spatial relationship of the TPP in the human brain and identified the connection areas in the prefrontal cortex...
2018: Frontiers in Neuroanatomy
https://www.readbyqxmd.com/read/29697631/facial-fractures-pearls-and-perspectives
#16
Obaid Chaudhry, Matthew Isakson, Adam Franklin, Suhair Maqusi, Christian El Amm
LEARNING OBJECTIVES: After studying this article, the participant should be able to: 1. Describe the A-frame configuration of anterior facial buttresses, recognize the importance of restoring anterior projection in frontal sinus fractures, and describe an alternative design and donor site of pericranial flaps in frontal sinus fractures. 2. Describe the symptoms and cause of pseudo-Brown syndrome, describe the anatomy and placement of a buttress-spanning plate in nasoorbitoethmoid fractures, and identify appropriate nasal support alternatives for nasoorbitoethmoid fractures...
May 2018: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/29689765/characterization-of-ct-hounsfield-units-for-3d-acquisition-trajectories-on-a-dedicated-breast-ct-system
#17
Jainil P Shah, Steve D Mann, Randolph L McKinley, Martin P Tornai
Hounsfield Units (HU) are used clinically in differentiating tissue types in a reconstructed CT image, and therefore the HU accuracy of a system is important, especially when using multiple sources, novel detector and non-traditional trajectories. Dedicated clinical breast CT (BCT) systems therefore should be similarly evaluated. In this study, uniform cylindrical phantoms filled with various uniform density fluids were used to characterize differences in HU values between simple circular and complex 3D (saddle) orbits...
April 18, 2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/29679587/orbital-floor-reconstruction-3-dimensional-analysis-shows-comparable-morphology-of-scapular-and-iliac-crest-bone-grafts
#18
Joel C Davies, Harley H L Chan, Jonathan M Bernstein, David P Goldstein, Jonathan C Irish, Ralph W Gilbert
PURPOSE: Current nonvascular osseous reconstructive options for reconstruction of the orbital floor after maxillectomy include options such as scapular tip and iliac crest bone grafts. The aim of this study was to determine whether these donor sites were morphologically comparable with the orbital floor. MATERIALS AND METHODS: A retrospective cross-sectional study design was selected. By use of a pre-existing melanoma database (January 1, 2005, through September 20, 2015), computed tomography scans of the head, neck, thorax, and pelvis were obtained from patients without evidence of bony metastases...
March 28, 2018: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29676403/combined-endoscopic-transorbital-and-endonasal-repair-of-high-flow-orbital-apex-middle-fossa-cerebrospinal-fluid-leak-with-a-nasoseptal-flap
#19
Brandon Lucke-Wold, Gustavo Mendez, David Cua, Paul Akins, Haley Gillham, Jeremy Ciporen
Background and importance: High flow orbital apex or middle fossa cerebrospinal fluid (CSF) leaks can be life threatening and complex to repair. These leaks associated with large dural defects are most commonly repaired with an open temporalis muscle patch or free flaps, but these flaps do not always stop the leak. Clinical Presentation: A 65-year-old patient presented two years after orbital exenteration and radiation for squamous cell carcinoma. He developed multi-organism meningitis and pneumocephalus secondary to a large high-flow orbital apex/middle fossa CSF leak...
2018: Journal of neuroinflammation and neurodegenerative diseases
https://www.readbyqxmd.com/read/29624808/perspectives-of-attosecond-spectroscopy-for-the-understanding-of-fundamental-electron-correlations
#20
REVIEW
Peter M Kraus, Hans Jakob Wörner
The description of the electronic structure of molecules in terms of molecular orbitals is a highly successful concept in chemistry. However, it commonly fails if the electrons in a molecule are strongly correlated and cannot be treated as independent particles. Electron correlation is essential to understand inner-valence X-ray spectroscopies, it can drive ultrafast charge migration in molecules, and it is responsible for many exotic properties of strongly correlated materials. Time-resolved spectroscopy with attosecond resolution is generally capable of following electronic motion in real time and can thus provide experimental access to electron-correlation-driven phenomena...
April 6, 2018: Angewandte Chemie
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