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Anatomic variations

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https://www.readbyqxmd.com/read/29454119/anatomical-study-of-the-nutrient-foramina-of-the-posterior-axis-with-application-to-c2-pedicle-screw-placement
#1
Tamir Tawfik, Joe Iwanaga, Emre Yilmaz, Paul Choi, Charlotte Wilson, Emily Simonds, Jared J Marks, Haynes L Harkey, Rod J Oskouian, R Shane Tubbs
OBJECTIVE: Pedicle screws placed into C2 necessitate a thorough understanding of this bone's unique anatomy. Although multiple landmarks and measurements have been used by surgeons, these are often varied in the literature with no consensus. Herein, we studied one recently proposed landmark using the nutrient foramina of the posterior aspect of C2 for pedicle screw placement. METHODS: On 19 (38 sides) C2 dry bone specimens, the presence, size, location, and distance from the midline of the nutrient foramina found at the junction between the isthmus and lamina were documented and measured...
February 14, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29452829/cribriform-plate-width-is-highly-variable-within-and-between-subjects
#2
Daniel H Coelho, Taylor S Pence, Mostafa Abdel-Hamid, Richard M Costanzo
OBJECTIVE: All successful endonasal surgery, including functional endoscopic sinus surgery (FESS), depends on knowledge of both anatomy and the specific variations that can occur between and within patients. Familiarity with these structures is a critical component in preventing complications from these procedures, and failure to understand subtle variation can have disastrous results. The aim of this study was to characterize the anatomical variations (if any) of the cribriform plate using a large cadaveric sample set...
February 13, 2018: Auris, Nasus, Larynx
https://www.readbyqxmd.com/read/29450567/coronal-tibial-anteromedial-tunnel-location-has-minimal-effect-on-knee-biomechanics
#3
Shigehiro Asai, Donghwi Kim, Yuichi Hoshino, Chan-Woong Moon, Akira Maeyama, Monica Linde, Patrick Smolinski, Freddie H Fu
PURPOSE: Studies have found anatomic variation in the coronal position of the insertion site of anteromedial (AM) bundle of the anterior cruciate ligament (ACL) on the tibia, which can lead to questions about tunnel placement during ACL reconstruction. The purpose of this study was to determine how mediolateral placement of the tibial AM graft tunnel in double-bundle ACL reconstructions affects knee biomechanics. METHODS: Two different types of double-bundle ACL reconstructions were performed...
February 15, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29447763/scaling-of-bony-canals-for-encephalic-vessels-in-euarchontans-implications-for-the-role-of-the-vertebral-artery-and-brain-metabolism
#4
Doug M Boyer, Arianna R Harrington
Supplying the central nervous system with oxygen and glucose for metabolic activities is a critical function for all animals at physiologic, anatomical, and behavioral levels. A relatively proximate challenge to nourishing the brain is maintaining adequate blood flow. Euarchontans (primates, dermopterans and treeshrews) display a diversity of solutions to this challenge. Although the vertebral artery is a major encephalic vessel, previous research has questioned its importance for irrigating the cerebrum. This presents a puzzling scenario for certain strepsirrhine primates (non-cheirogaleid lemuriforms) that have reduced promontorial branches of the internal carotid artery and no apparent alternative encephalic vascular route except for the vertebral artery...
January 2018: Journal of Human Evolution
https://www.readbyqxmd.com/read/29446812/surgical-management-of-primary-crohn-s-disease-descriptive-study-about-226-patients
#5
Amin Makni, Houcine Magherbi, Azza El Heni, Anis Haddad, Amin Daghfouss, Wael Rebai, Faouzi Chebbi, Rachid Ksantini, Fadhel Fterich, Mohamed Jouini, Montasser Kacem, Nabil Ben Mami, Azza Filali, Zoubeir Ben Safta
BACKGROUND: The surgery is required in more than 80% of patients with Crohn's disease (CD). Studies before confirm the specific genetic variation of CD in the Tunisian population compared with the others ethnic groups. AIM: This article aims to study the epidemiological, anatomical and therapeutic principles of surgical forms of CD in a cohort of Tunisian patients. METHODS: We report a retrospective study from January 1998 to September 2010 that studied 226 patients originated only from Tunisia (in North Africa), operated on for MC...
March 2017: La Tunisie Médicale
https://www.readbyqxmd.com/read/29445593/minimally-invasive-techniques-in-thymic-surgery-a-worldwide-perspective
#6
REVIEW
Hasan Fevzi Batirel
Minimally invasive surgical techniques are important in surgical management of thymic pathologies. Traditional access techniques are being replaced with minimally invasive techniques using multiportal or uniportal approach. Adoption of minimally invasive techniques for thymic malignancies has been slow due to long term recurrence concerns. Recent studies show that minimally invasive video-assisted thoracoscopic surgery (VATS) or robotic approach to early stage thymic malignancies are associated with less intraoperative bleeding, lower rate of respiratory complications, shorter chest tube duration and shorter hospital stay...
2018: Journal of Visualized Surgery
https://www.readbyqxmd.com/read/29445428/the-danger-zone-in-the-anterior-neck-anatomical-landmarks-to-avoid-injury-to-anterior-jugular-vein-during-face-lift-and-neck-lift
#7
Andrew M Swiergosz, J Stephen Gunn, Steven A Schulz, Joshua T Henderson, Joshua H Choo, Arian Mowlavi, Bradon J Wilhelmi
Background : An estimated 125,711 face-lifts and 54,281 neck-lifts were performed in 2015. Regardless of the technique employed, facial and neck flap elevation carries with it anatomical risk of which any surgeon performing these procedures should be aware of. Statistics related to anterior jugular vein injury during these procedures have not been published. Objective : To define a "danger zone" that will contain both of the anterior jugular veins on the basis of anatomical landmarks to aid surgeons with planning their surgical approach during rhytidectomy in the anterior neck region...
2018: Eplasty
https://www.readbyqxmd.com/read/29444377/a-biomechanical-analysis-of-prognathous-and-orthognathous-insect-head-capsules-evidence-for-a-many-to-one-mapping-of-ridge-strain-to-head-strain
#8
Alexander Blanke, Manuel Pinheiro, Peter J Watson, Michael J Fagan
Insect head shapes are remarkably variable but the influences of these changes on biomechanical performance are unclear. Among "basal" winged insects, such as dragonflies, mayflies, earwigs, and stoneflies, some of the most prominent anatomical changes are the general mouthpart orientation, eye size and the connection of the endoskeleton to the head. Here, we assess these variations as well as differing ridge and sclerite configurations using modern engineering methods including multibody dynamics modelling and finite element analysis in order to quantify and compare the influence of anatomical changes on strain in particular head regions and the whole head...
February 14, 2018: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/29441475/robot-assisted-distal-gastrectomy-with-lymph-node-dissection-for-gastric-cancer-in-a-patient-with-situs-inversus-partialis-a-case-report-with-video-file
#9
Yuki Aisu, Yoshio Kadokawa, Shigeru Kato, Daiki Yasukawa, Yusuke Kimura, Tomohide Hori
BACKGROUND: Situs inversus is a rare congenital condition that is currently classified into two types: complete situs inversus (situs inversus totalis, SIT) and partial situs inversus (situs inversus partialis, SIP). In SIP patients, some organs are inverted and others are in their expected position, and individual patient variation in organ position increases surgical difficulty. Several surgeons have performed laparoscopic or robotic surgeries in situs inversus patients, but almost all were SIT patients...
February 13, 2018: Surgical Case Reports
https://www.readbyqxmd.com/read/29437201/variations-during-ageing-in-the-three-dimensional-anatomical-arrangement-of-fascicles-within-the-equine-superficial-digital-flexor-tendon
#10
O J Ali, E J Comerford, P D Clegg, E G Canty-Laird
BiTendons are constructed from collagenous fascicles separated by endotenon/interfascicular matrix (IFM). Tendons may be specialised for precision movement or to store energy during locomotion and for the latter the elasticity of the endotenon/IFM is particularly important. The equine superficial digital flexor tendon (SDFT) is a dedicated energy-storing tendon with a similar function to the human Achilles tendon. Classical anatomical descriptions portray fascicles as longitudinally arranged distinct anatomical structures...
February 13, 2018: European Cells & Materials
https://www.readbyqxmd.com/read/29435250/adaptations-of-white-spruce-to-climate-strong-intraspecific-differences-in-cold-hardiness-linked-to-survival
#11
Jaime Sebastian-Azcona, Uwe G Hacke, Andreas Hamann
Understanding local adaptation of tree populations to climate allows the development of assisted migration guidelines as a tool for forest managers to address climate change. Here, we study the relationship among climate, a wide range of physiological traits, and field performance of selected white spruce provenances originating from throughout the species range. Tree height, survival, cold hardiness, hydraulic, and wood anatomical traits were measured in a 32-year-old common garden trial, located in the center of the species range...
February 2018: Ecology and Evolution
https://www.readbyqxmd.com/read/29435241/interannual-variations-in-needle-and-sapwood-traits-of-pinus-edulis-branches-under-an-experimental-drought
#12
Marceau Guérin, Dario Martin-Benito, Georg von Arx, Laia Andreu-Hayles, Kevin L Griffin, Rayann Hamdan, Nate G McDowell, Robert Muscarella, William Pockman, Pierre Gentine
In the southwestern USA, recent large-scale die-offs of conifers raise the question of their resilience and mortality under droughts. To date, little is known about the interannual structural response to droughts. We hypothesized that piñon pines (Pinus edulis) respond to drought by reducing the drop of leaf water potential in branches from year to year through needle morphological adjustments. We tested our hypothesis using a 7-year experiment in central New Mexico with three watering treatments (irrigated, normal, and rain exclusion)...
February 2018: Ecology and Evolution
https://www.readbyqxmd.com/read/29434687/is-fetal-type-posterior-cerebral-artery-a-risk-factor-for-intracranial-aneurysm-as-analyzed-by-multislice-ct-angiography
#13
Zhen He, Yeda Wan
Fetal-type posterior cerebral artery (FTP) is a common anatomic variation that is closely associated with intracranial aneurysm. In the present study, multislice computed tomography angiography (CTA) was performed to assess whether FTP is a risk factor for intracranial aneurysm. CTA data of 364 consecutive cases of patients who were suspected with cerebrovascular disease or intracranial aneurysm of intracranial artery from 2013 to 2016 were reviewed and the incidence rates of FTP, other variations of the circle of Willis, intracranial aneurysm and FTP with intracranial aneurysm were evaluated...
January 2018: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29433396/variations-in-the-vascular-and-biliary-structures-of-the-liver-a-comprehensive-anatomical-study
#14
Burak Veli Ülger, Eyüp Savaş Hatipoğlu, Özgür Ertuğrul, Mehmet Cudi Tuncer, Cihan Akgül Özmen, Mesut Gül
PURPOSE: Vascular structures of the liver and the bile ducts are crucial during liver transplantation or liver resection surgery. Here, we report on variations in the vascular structures and bile ducts of 200 patients. MATERIALS AND METHODS: We reviewed magnetic resonance cholangiopancreatographic and multiple-detector computed tomographic data. RESULTS: Michels type 1 was detected in 54% of the patients. The other most common variations were, respectively, Michels type 5 (13%) and type 2 (11%)...
February 12, 2018: Acta Chirurgica Belgica
https://www.readbyqxmd.com/read/29430937/removal-of-evidential-motion-contaminated-and-poorly-fitted-image-data-improves-ivim-diffusion-mri-parameter-scan-rescan-reproducibility
#15
Olivier Chevallier, Nan Zhou, Jian He, Romaric Loffroy, Yì Xiáng J Wáng
Background It has been reported that intravoxel incoherent motion (IVIM) diffusion magnetic resonance imaging (MRI) scan-rescan reproducibility is unsatisfactory. Purpose To study IVIM MRI parameter reproducibility for liver parenchyma after the removal of motion-contaminated and/or poorly fitted image data. Material and Methods Eighteen healthy volunteers had liver scans twice in the same session to assess scan-rescan repeatability, and again in another session after an average interval of 13 days to assess reproducibility...
January 1, 2018: Acta Radiologica
https://www.readbyqxmd.com/read/29430479/toward-quantitative-quasistatic-elastography-with-a-gravity-induced-deformation-source-for-image-guided-breast-surgery
#16
Rebekah H Griesenauer, Jared A Weis, Lori R Arlinghaus, Ingrid M Meszoely, Michael I Miga
Biomechanical breast models have been employed for applications in image registration and diagnostic analysis, breast augmentation simulation, and for surgical and biopsy guidance. Accurate applications of stress-strain relationships of tissue within the breast can improve the accuracy of biomechanical models that attempt to simulate breast deformations. Reported stiffness values for adipose, glandular, and cancerous tissue types vary greatly. Variations in reported stiffness properties have been attributed to differences in testing methodologies and assumptions, measurement errors, and natural interpatient differences in tissue elasticity...
January 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29430105/accessory-branch-of-canalis-sinuosus-mimicking-external-root-resorption-a-diagnostic-dilemma
#17
Priyal Naresh Shah, Ankit V Arora, Sonali V Kapoor
The aim of this study was to recognize the importance of canalis sinuosus in Endodontics. A 60-year-old male patient reported with the chief complaint of pain and swelling in upper front tooth region for 2 weeks with a history of trauma 21 years back. Clinical examination revealed fractured tooth 21 (maxillary left central incisor) with an associated sinus tract. Radiographic examination revealed diffuse periapical radiolucency in relation to tooth 21 and external resorptive defect in apical third of the root of tooth 11 (maxillary right central incisor)...
November 2017: Journal of Conservative Dentistry: JCD
https://www.readbyqxmd.com/read/29429510/characterization-and-spatial-relationships-of-the-hepatic-vascular-biliary-tracts-and-their-associated-pancreocytes-and-macrophages-in-the-model-fish-guppy-poecilia-reticulata-a-study-of-serial-sections-by-light-microscopy
#18
Sisandra Sousa, Maria J Rocha, Eduardo Rocha
The guppy is a tropical fish that has been used as an experimental model organism in science. It is a species well adapted to the natural environment and that can support adverse environmental conditions, and so, at occasions, its presence can be indicative of environmental disturbances. Moreover, as the liver is very important when studying fish diseases, the knowledge of normal microanatomy is essential to assess histological changes, e.g., related to environmental change or toxic pollutants. The target organ of this histological study is the liver...
February 2018: Tissue & Cell
https://www.readbyqxmd.com/read/29423703/bilateral-coronoid-foramina-with-accessory-foramina-on-the-lateral-aspect-of-ramus-of-mandible-an-unseen-variance-discovery-in-humans
#19
Nyer Firdoose Chintamani Subhan
The normal flexibility in morphology and topography of body structures may be termed as an anatomical variation. This manuscript, aims to present a unique discovery of 'coronoid foramina' bilaterally along with bilateral accessory foramina over the 'lateral aspect of the ramus of the mandible' which has never been seen or documented in the literature so far in a live patient. It is noteworthy to realize a trait of phylogenetic context in these discoveries.
February 8, 2018: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/29423089/rs2459976-in-zw10-gene-associated-with-congenital-heart-diseases-in-chinese-han-population
#20
Chao-Yu Sun, Chi Sun, Rui Cheng, Shuai Shi, Ying Han, Xue-Qi Li, Ji-Xin Zhi, Fei-Feng Li, Shu-Lin Liu
Congenital heart diseases (CHD) are a large group of prevalent and complex anatomic malformations of the heart, with the genetic basis remaining largely unknown. Since genes or factors associated with the differentiation of human embryonic stem (HES) cells would affect the development of all embryonic tissues, including cardiac progenitor cells, we postulated their potential roles in CHD. In this study, we focused on ZW10, a kinetochore protein involved in the process of proper chromosome segregation, and conducted comparative studies between CHD patients and normal controls matched in gender and age in Chinese Han populations...
January 9, 2018: Oncotarget
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