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https://www.readbyqxmd.com/read/29775563/anolis-carolinensis-as-a-model-to-understand-molecular-and-cellular-basis-of-foveal-development
#1
Naif S Sannan, Xianghong Shan, Kevin Gregory-Evans, Kenro Kusumi, Cheryl Y Gregory-Evans
The fovea is an anatomical specialization of the central retina containing closely packed cone-photoreceptors providing an area of high acuity vision in humans and primates. Despite its key role in the clarity of vision, little is known about the molecular and cellular basis of foveal development, due to the absence of a foveal structure in commonly used laboratory animal models. Of the amniotes the retina in birds of prey and some reptiles do exhibit a typical foveal structure, but they have not been studied in the context of foveal development due to lack of availability of embryonic tissue, lack of captive breeding programs, and limited genomic information...
May 15, 2018: Experimental Eye Research
https://www.readbyqxmd.com/read/29770500/variable-anatomic-configuration-of-the-posterior-spinal-arteries-in-humans
#2
Santiago Rojas, Marisa Ortega, Alfonso Rodríguez-Baeza
INTRODUCTION: Posterior spinal arteries (PSAs) arise from the vertebral (VA) or posterior inferior cerebellar (PICA) artery. We identified variations in their origins and their anastomosis with the first posterior radiculomedullary branches in human spinal cords. MATERIALS AND METHODS: Spinal cords from male and female cadavers (n = 30) were injected with colored latex through the vertebral, ascending cervical, costocervical trunk and segmental arteries. Specimens were fixed in formalin and the spinal arteries were dissected under a surgical microscope...
May 17, 2018: Clinical Anatomy
https://www.readbyqxmd.com/read/29770228/acoustic-radiation-force-impulse-arfi-elastography-in-a-cohort-of-alpha-1-antitrypsin-deficient-individuals-and-healthy-volunteers
#3
Sandra Diaz, Behrouz Mostafavi, Hanan A Tanash, Eeva Piitulainen
Background: Acoustic radiation force impulse (ARFI) elastography has been used to assess liver stiffness non-invasively. However, its usefulness in alpha-1 antitripsin-deficient (AATD) individuals is unknown. Purpose: To assess if liver fibrosis is present in a cohort of AATD individuals using ARFI elastography. Material and Methods: Eighty-three participants aged 38-39 years, except for two who were aged 40 years, underwent ultrasound elastography of the liver with ARFI technique...
April 2018: Acta Radiologica Open
https://www.readbyqxmd.com/read/29768079/the-spectrum-of-surgical-remediation-of-transoral-incisionless-fundoplication-related-failures
#4
Ruchir Puri, C Daniel Smith, Steven P Bowers
AIM: To evaluate outcomes of surgical remediation for symptomatic or anatomic failure after a transoral incisionless fundoplication (TIF). METHODS: This retrospective study was performed on 11 patients who underwent a remedial operation following TIF failure between June 2011 and September 2016 at the Mayo Clinic in Florida for persistent foregut symptoms. Upper gastrointestinal workup characterized 1 patient as having normal post-TIF anatomy and 10 as having anatomic failure...
May 16, 2018: Journal of Laparoendoscopic & Advanced Surgical Techniques. Part A
https://www.readbyqxmd.com/read/29767420/ocular-coherence-tomography-measured-changes-over-time-in-anterior-chamber-angle-and-diurnal-intraocular-pressure-after-laser-iridotomy-impact-study
#5
Ivailo Zhekov, Shahina Pardhan, Rupert Ra Bourne
IMPORTANCE: The change in the anatomical dimensions over time and the effect on diurnal intraocular pressure (DIOP) following laser peripheral iridotomy is poorly understood. BACKGROUND: To evaluate change over time in anterior chamber angle anatomy following laser peripheral iridotomy (LPI) in patients with primary angle closure compared to control eyes. Additionally, the effect of LPI on DIOP fluctuation was investigated. DESIGN: Longitudinal, prospective, double-randomized research study...
May 16, 2018: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/29765829/injury-of-the-carotid-artery-during-endoscopic-endonasal-surgery-surveys-of-skull-base-surgeons
#6
Nicholas R Rowan, Meghan T Turner, Benita Valappil, Juan C Fernandez-Miranda, Eric W Wang, Paul A Gardner, Carl H Snyderman
Objectives  This study aimed to review endoscopic skull base surgeon experience with internal carotid artery (ICA) injuries during endoscopic endonasal surgery (EES) to provide an estimate of the incidence of ICA injury, the associated factors and identify the best training modalities for the management of this complication. Design  Anonymous electronic survey of past participants at a well-established endoscopic skull base surgery course and a global online community of skull base surgeons. Main Outcome Measures  Relative incidence of ICA injuries during EES, associated anatomic and intraoperative factors, and surgeon experience...
June 2018: Journal of Neurological Surgery. Part B, Skull Base
https://www.readbyqxmd.com/read/29764458/cone-beam-computed-tomography-in-implant-dentistry-recommendations-for-clinical-use
#7
Reinhilde Jacobs, Benjamin Salmon, Marina Codari, Bassam Hassan, Michael M Bornstein
BACKGROUND: In implant dentistry, three-dimensional (3D) imaging can be realised by dental cone beam computed tomography (CBCT), offering volumetric data on jaw bones and teeth with relatively low radiation doses and costs. The latter may explain why the market has been steadily growing since the first dental CBCT system appeared two decades ago. More than 85 different CBCT devices are currently available and this exponential growth has created a gap between scientific evidence and existing CBCT machines...
May 15, 2018: BMC Oral Health
https://www.readbyqxmd.com/read/29759948/measuring-relative-positions-and-orientations-of-the-tibia-with-respect-to-the-femur-using-one-channel-3d-tracked-a-mode-ultrasound-tracking-system-a-cadaveric-study
#8
Kenan Niu, Jasper Homminga, Victor Sluiter, André Sprengers, Nico Verdonschot
The purpose of this study is to investigate the technical feasibility of measuring relative positions and orientations of the tibia with respect to the femur in an in-vitro experiment by using a 3D-tracked A-mode ultrasound system and to determine its accuracy of angular and translational measurements. As A-mode ultrasound is capable of detecting bone surface through soft tissue in a non-invasive manner, the combination of a single A-mode ultrasound transducer with an optical motion tracking system provides the possibility for digitizing the 3D locations of bony points at different anatomical regions on the thigh and the shank...
May 11, 2018: Medical Engineering & Physics
https://www.readbyqxmd.com/read/29759775/real-time-x-mri-guided-left-ventricular-lead-implantation-for-targeted-delivery-of-cardiac-resynchronization-therapy
#9
Jonathan M Behar, Peter Mountney, Daniel Toth, Sabrina Reiml, Maria Panayiotou, Alexander Brost, Bernhard Fahn, Rashed Karim, Simon Claridge, Tom Jackson, Ben Sieniewicz, Nik Patel, Mark O'Neill, Reza Razavi, Kawal Rhode, Christopher Aldo Rinaldi
OBJECTIVES: This study sought to test the feasibility of a purpose-built, integrated software platform to process, analyze, and overlay cardiac magnetic resonance (CMR) data in real time within a combined cardiac catheter laboratory and magnetic resonance imaging scanner suite (X-MRI) to guide left ventricular (LV) lead implantation. BACKGROUND: Suboptimal LV lead position is a major determinant of poor cardiac resynchronization therapy (CRT) response, and the optimal site is highly patient specific...
August 2017: JACC. Clinical Electrophysiology
https://www.readbyqxmd.com/read/29755840/treatment-of-mallet-finger-deformity-with-a-modified-palmaris-longus-tendon-graft-through-a-bone-tunnel
#10
Zengbing Liu, Kai Ma, Dong Huang
OBJECTIVE: To investigate the clinical effect of treating mallet finger deformity using a modified palmaris longus tendon graft through a bone tunnel. METHODS: Altogether, 21 patients with mallet finger deformity (16 men, 5 women; average age 31 years, range 19-47 years) were treated with a modified palmaris longus tendon graft through a bone tunnel during 18 months (2014-2016). Four index fingers, seven middle fingers, eight ring fingers, and two little fingers were treated for four cutting injuries, eleven finger sprains, four crush injuries, and two twist injuries (7 open and 14 closed injuries)...
2018: International Journal of Burns and Trauma
https://www.readbyqxmd.com/read/29755825/bilateral-asymmetric-rhegmatogenous-retinal-detachment-in-a-patient-with-stickler-syndrome
#11
Caner Öztürk, Almila Sarıgül Sezenöz, Gürsel Yılmaz, İmren Akkoyun
Here we present the long-term anatomical and visual outcomes of bilateral asymmetric rhegmatogenous retinal detachment repair in a patient with Stickler syndrome. A 17-year-old girl presented with decreased visual acuity in both eyes for more than one year. Her best-corrected visual acuity (BCVA) was 0.1 in the right eye and 0.05 in the left eye. Slit-lamp anterior segment examination revealed subcapsular cataract in both eyes. Fundus examination showed bilateral rhegmatogenous retinal detachment, chronic retinal detachment accompanied by multiple retinal holes, tears and membranous fibrillary vitreous in the peripheral retina...
April 2018: Turkish Journal of Ophthalmology
https://www.readbyqxmd.com/read/29755770/safety-and-initial-efficacy-of-radiation-segmentectomy-for-the-treatment-of-hepatic-metastases%C3%A2
#12
Craig Meiers, Amy Taylor, Brian Geller, Beau Toskich
Background: Hepatic metastatectomy and ablation are associated with prolonged survival, but not all lesions are anatomically amenable to these therapies. We evaluated safety and initial efficacy of segmental ablative transarterial radioembolization, or radiation segmentectomy (RS), as a treatment for hepatic metastases. Methods: A single institution retrospective analysis was performed of patients with hepatic metastases, determined unamenable to resection by a multidisciplinary tumor board, treated with RS from 2015-2017...
April 2018: Journal of Gastrointestinal Oncology
https://www.readbyqxmd.com/read/29754940/radioguided-hepatic-resection-with-18-f-dopa-in-a-patient-with-metastatic-medullary-thyroid-carcinoma
#13
J López-Gómez, S Medina-Ornelas, M A Salazar-Álvarez, M Álvarez-Bojórquez, N Zaragoza-Cruz, J Melchor-Ruan, A Álvarez-Cano
INTRODUCTION: Medullary carcinoma accounts for 1-2% of all thyroid malignancies. 13-20% of patients present with distant metastasis, with 45% of the cases affecting the liver. CLINICAL CASE: A 50-year-old woman, diagnosed with medullary thyroid carcinoma, was treated with total thyroidectomy and a modified neck dissection in 1999. Two lymph node recurrences in the neck were treated with surgical resection; during surveillance, she developed elevated calcitonin levels, the recurrence site was identified with 18 F-DOPA PET/CT in the liver...
May 10, 2018: Revista Española de Medicina Nuclear e Imagen Molecular
https://www.readbyqxmd.com/read/29753451/single-stage-reconstruction-of-post-traumatic-and-post-excisional-composite-perigenual-defects-using-chimeric-pedicled-propelled-osteomyocutaneous-fibula-flap
#14
T M Balakrishnan, Sruthi Sridhar, J Jaganmohan, Hemantha Kumar Govinda Rajan, Singaravadivelu Vaidyanathan
INTRODUCTION: Composite perigenual defects (CPGDs) are exacting the expertise of the reconstructive surgeons. Segmental skeletal defects continue to be a challenge for both orthopedic and plastic surgeons. There are many techniques available for the reconstruction of segmental skeletal defects in the perigenual region. This study explores the outcomes of pedicled chimeric propelled osteomyocutaneous fibula flap reconstruction of post traumatic and post excisional composite perigenual defects (CPGDs) MATERIALS AND METHODS: It was a retrospective study conducted from 2011 to 2016 including 16 patients (5 post excisional defects and 11 post traumatic defects)...
April 27, 2018: Injury
https://www.readbyqxmd.com/read/29751180/radiographic-study-of-lumbar-sympathetic-trunk-in-the-oblique-lateral-interbody-fusion-surgery
#15
Hongli Wang, Yuxuan Zhang, Xiaosheng Ma, Xinlei Xia, Feizhou Lu, Jianyuan Jiang
BACKGROUND: Oblique lateral interbody fusion (OLIF) surgery provides a convenient and minimal access to the lesion disc with few complications, however, the left lumbar sympathetic trunk (LST) lies in the surgical field with an certain incidence of injury. The aim of this study was to describe the anatomical structures of the left LST at risk for injury during oblique lateral interbody fusion at different lumbar segment levels based on radiological evaluations. METHODS: 44 healthy young people (22 males and 22 females) were recruited and routine lumbar MR radiograph were performed...
May 8, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29750754/the-barrow-biomimetic-spine-fluoroscopic-analysis-of-a-synthetic-spine-model-made-of-variable-3d-printed-materials-and-print-parameters
#16
Michael A Bohl, Michael A Mooney, Garrett J Repp, Peter Nakaji, Steve W Chang, Jay D Turner, U Kumar Kakarla
STUDY DESIGN: Objective and subjective fluoroscopic assessments of a new synthetic spine model. OBJECTIVE: To analyze the fluoroscopic performance and fidelity to human tissue of a new synthetic spine model. SUMMARY OF BACKGROUND DATA: The [blinded for review] Biomimetic Spine project aims to develop a 3-dimensional (3D) printed, synthetic spine model that will one day replace cadaveric tissue in spine biomechanical research. A crucial component to any biomimetic spine model is that it performs similarly to cadaveric tissue on standard diagnostic imaging modalities...
May 10, 2018: Spine
https://www.readbyqxmd.com/read/29748699/longitudinal-deformation-of-the-right-ventricle-in-hypoplastic-left-heart-syndrome-a-comparative-study-of-2d-feature-tracking-magnetic-resonance-imaging-and-2d-speckle-tracking-echocardiography
#17
Mona Salehi Ravesh, Carsten Rickers, Finn Jonathan Bannert, David Hautemann, Abdullah Al Bulushi, Dominik Daniel Gabbert, Philip Wegner, Eva Kis, Jan Hinnerk Hansen, Michaeal Jerosch-Herold, H-H Kramer, Jana Logoteta
In hypoplastic left heart syndrome (HLHS), long-term outcome is closely related to right ventricular function. Echocardiography and magnetic resonance imaging (MRI) are routinely used for functional assessment. MRI 2D-tissue feature tracking (2D-FT) allows quantification of myocardial deformation but has not yet been applied to HLHS patients. We sought to investigate the feasibility of this technique and to compare the results to 2D-speckle tracking echocardiography (2D-STE). In routine MRI 2D anatomical four chamber view, cine images were recorded in 55 HLHS patients (median age 4...
May 10, 2018: Pediatric Cardiology
https://www.readbyqxmd.com/read/29741595/insula-connections-with-the-parieto-frontal-circuit-for-generating-arm-actions-in-humans-and-macaque-monkeys
#18
G Di Cesare, C Pinardi, C Carapelli, F Caruana, M Marchi, M Gerbella, G Rizzolatti
It has been recently found that the human dorso-central insular cortex contributes to the execution and recognition of the affective component of hand actions, most likely through modulation of the activity of the parieto-frontal circuits. While the anatomical connections between the hand representation of the insula and, the parietal and frontal regions controlling reaching/grasping actions is well assessed in the monkey, it is unknown the existence of a homolog circuit in humans. In the present study, we performed a multifiber tractography investigation to trace the tracts possibly connecting the insula to the parieto-frontal circuits by locating seeds in the parietal, premotor, and prefrontal nodes of the reaching/grasping network, in both humans and monkeys...
May 7, 2018: Cerebral Cortex
https://www.readbyqxmd.com/read/29736800/automatic-segmentation-of-stereoelectroencephalography-seeg-electrodes-post-implantation-considering-bending
#19
Alejandro Granados, Vejay Vakharia, Roman Rodionov, Martin Schweiger, Sjoerd B Vos, Aidan G O'Keeffe, Kuo Li, Chengyuan Wu, Anna Miserocchi, Andrew W McEvoy, Matthew J Clarkson, John S Duncan, Rachel Sparks, Sébastien Ourselin
PURPOSE: The accurate and automatic localisation of SEEG electrodes is crucial for determining the location of epileptic seizure onset. We propose an algorithm for the automatic segmentation of electrode bolts and contacts that accounts for electrode bending in relation to regional brain anatomy. METHODS: Co-registered post-implantation CT, pre-implantation MRI, and brain parcellation images are used to create regions of interest to automatically segment bolts and contacts...
May 7, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29735176/rapid-seedling-establishment-and-a-narrow-root-stele-promotes-waterlogging-tolerance-in-spring-wheat
#20
Tove Kristina Sundgren, Anne Kjersti Uhlen, Morten Lillemo, Christoph Briese, Tobias Wojciechowski
Improving the waterlogging tolerance of wheat varieties could alleviate yield constraints caused by excessive rain and poor soil drainage. In this study, we investigated root and shoot growth as well as anatomical traits of six spring wheat genotypes with contrasting waterlogging tolerance properties. Our aim was to identify root traits that differentiate tolerant from sensitive genotypes. Two experiments were conducted using rhizoboxes and photography for data acquisition. In experiment one, root growth of the genotypes was studied during seedling establishment and a subsequent waterlogging treatment, starting at the 3-leaf stage and maintained for seven days...
April 24, 2018: Journal of Plant Physiology
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