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variations of normal anatomy

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https://www.readbyqxmd.com/read/28215346/a-micro-computed-tomography-evaluation-of-the-shaping-ability-of-two-nickel-titanium-instruments-hyflex-edm-and-protaper-next
#1
Pier Matteo Venino, Claudio Luigi Citterio, Alberto Pellegatta, Marta Ciccarelli, Marcello Maddalone
INTRODUCTION: The aim of this study was to evaluate and compare, by means of micro-computed tomography imaging, the shaping ability of ProTaper Next (PTN) and the novel HyFlex EDM (HFEDM) instruments. METHODS: Forty teeth were randomly divided into 2 groups and prepared with PTN or HFEDM. Root canal transportation and centering ratio were evaluated in mesiodistal and buccolingual directions at 5 levels (at the midpoint of the apical, middle, and coronal thirds and at the boundaries between them)...
February 15, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28210449/oral-mucosal-lesions-in-a-chilean-elderly-population-a-retrospective-study-with-a-systematic-review-from-thirteen-countries
#2
César Rivera, Daniel Droguett, María-Jesús Arenas-Márquez
BACKGROUND: The oral examination is an essential part of the multidisciplinary medical care in elderly people. Oral mucosal lesions and normal variations of oral anatomy (OMLs) are very common in this people, but few studies have examined the frequency and prevalence of these conditions worldwide and less in Chile. The aim of this research was to evaluate the frequency of OMLs in a Chilean elderly population. MATERIAL AND METHODS: It was conducted a retrospective study (Talca, Chile)...
February 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28179915/a-review-on-root-anatomy-and-canal-configuration-of-the-maxillary-second-molars
#3
REVIEW
Negin Ghasemi, Saeed Rahimi, Shahriar Shahi, Mohammad Samiei, Mohammad Frough Reyhani, Bahram Ranjkesh
INTRODUCTION: The complexity of the root canal system presents a challenge for the practitioner. This systematic review evaluated the papers published in the field of root canal anatomy and configuration of the root canal system in permanent maxillary second molars. METHODS AND MATERIALS: All articles related to the root morphology and root canal anatomy of the permanent maxillary second molars were collected by suitable keywords from PubMed database. The exhaustive search included all publications from 1981 to December 2015...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28177991/variations-in-the-vascular-anatomy-of-the-right-colon-and-implications-for-right-sided-colon-surgery
#4
Mehmet Ayhan Kuzu, Erkin İsmail, Safa Çelik, Muhammed Feyzi Şahin, Mehmet Ali Güner, Werner Hohenberger, Halil İbrahim Açar
BACKGROUND: Knowledge of the normal pattern and variations of the blood supply of the right colon is crucial for better outcomes after colon surgery. OBJECTIVE: The purpose of this study was to describe the precise vascular anatomy of the right colon according to surgical perspective. DESIGN: Adult fresh cadavers were dissected between January 2013 and October 2015, focusing on the venous and arterial anatomy of the right side of the colon...
March 2017: Diseases of the Colon and Rectum
https://www.readbyqxmd.com/read/28150270/circle-of-willis-variations-and-artery-diameter-measurements-in-the-turkish-population
#5
Ibrahim Önder Yeniçeri, Neşat Çullu, Mehmet Deveer, Emine Neşe Yeniçeri
BACKGROUND: The aim of this study was to evaluate the frequency of COW variations and the measurements of the COW vessel diameters in the Turkish population. MATERIALS AND METHODS: The patient population for this single-centre, retrospective study was formed of patients who had brain MRA. A total of 384 subjects were included in the study. The 3D TOF technique was used for MRA imaging to evaluate the anatomy of the COW. Variations in the COW were recorded. The diameter of the critical arteries of the COW were measured...
February 2, 2017: Folia Morphologica (Warsz)
https://www.readbyqxmd.com/read/28143859/replaced-right-and-left-hepatic-arteries-a-variation-in-origin-and-course
#6
Mohammed Asif, Leslie S Anewenah, Nisha Reddy, Farrukh A Khan
In ∼60% of cases, hepatic artery anatomy is of the normal variant. However, in 40% of cases, anomalies can exist. Preserving the hepatic blood supply is paramount in hepatobiliary procedures. We report an aberrant right hepatic artery coursing retroportally, with an aberrant left hepatic artery originating directly from the coeliac artery in a patient who underwent an elective pancreaticoduodenectomy (Whipple procedure).
January 31, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28139318/cochlear-duct-length-one-size-fits-all
#7
J F Thong, D Low, A Tham, C Liew, T Y Tan, H W Yuen
OBJECTIVE: Recent studies demonstrated the utility of high-resolution computed tomography (HRCT) scans in measuring basal cochlear length and cochlear insertion depths. These studies showed significant variations in the anatomy of the cochlea amongst humans. The aim of our study was to investigate for gender and racial variations in the basal turn length of the human cochlea in an Asian population. METHOD: HRCT temporal bone data from year 1997 till 2012 of patients with normally developed cochleae who reported with otologic disease was obtained...
January 21, 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/28103500/thoracoscopic-surgery-in-the-prone-position-for-esophageal-cancer-in-patients-with-situs-inversus-totalis-a-report-of-two-cases
#8
Toru Nakano, Takashi Kamei, Yu Onodera, Naoto Ujiie, Noriaki Ohuchi
INTRODUCTION: Situs inversus totalis (SIT) is a rare congenital condition characterized by a complete transposition of thoracic and abdominal organs. Here, we present two successful cases of left thoracoscopic esophagectomy in the prone position for SIT-associated esophageal cancer. PRESENTATION OF CASE: Our first case was of an 82-year-old man who underwent a left thoracoscopic esophagectomy in the prone position, followed by hand-assisted laparoscopic gastric mobilization...
January 6, 2017: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/28076015/us-and-mr-imaging-of-pectoralis-major-injuries
#9
Yauk K Lee, Matt R Skalski, Eric A White, Anderanik Tomasian, Diane D Phan, Dakshesh B Patel, George R Matcuk, Aaron J Schein
During the past 2 decades, the frequency of pectoralis major muscle injuries has increased in association with the increased popularity of bench press exercises. Injury of the pectoralis major can occur at the muscle origin, muscle belly, musculotendinous junction, intratendinous region, and/or humeral insertion-with or without bone avulsion. The extent of the tendon injury ranges from partial to complete tears. Treatment may be surgical or conservative, depending on the clinical scenario and anatomic characteristics of the injury...
January 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28066735/arthroscopic-approach-and-anatomy-of-the-hip
#10
Alessandro Aprato, Matteo Giachino, Alessandro Masse
BACKGROUND: Hip arthroscopy has gained popularity among the orthopedic community and a precise assessment of indications, techniques and results is constantly brought on. METHODS: In this chapter the principal standard entry portals for central and peripheral compartment are discussed. The description starts from the superficial landmarks for portals placement and continues with the deep layers. For each entry point an illustration of the main structures encountered is provided and the principal structures at risk for different portals are accurately examined...
July 2016: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/28048870/su-f-j-81-evaluation-of-automated-deformable-registration-between-planning-computed-tomography-ct-and-daily-cone-beam-ct-images-over-the-course-of-prostate-cancer-radiotherapy
#11
J Matney, J Hammers, O Kaidar-Person, A Wang, R Chen, S Das, L Marks, P Mavroidis
PURPOSE: To compute daily dose delivered during radiotherapy, deformable registration needs to be relatively fast, automated, and accurate. The aim of this study was to evaluate the performance of commercial deformable registration software for deforming between two modalities: planning computed tomography (pCT) images acquired for treatment planning and cone beam (CB) CT images acquired prior to each fraction of prostate cancer radiotherapy. METHODS: A workflow was designed using MIM Software™ that aligned and deformed pCT into daily CBCT images in two steps: (1) rigid shifts applied after daily CBCT imaging to align patient anatomy to the pCT and (2) normalized intensity-based deformable registration to account for interfractional anatomical variations...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048684/su-f-t-115-uncertainty-in-the-esophagus-dose-in-retrospective-epidemiological-study-of-breast-cancer-radiotherapy-patients
#12
E Mosher, S Kim, C Lee, C Pelletier, J Jung, E Jones, C Lee
PURPOSE: Epidemiological studies of second cancer risks in breast cancer radiotherapy patients often use generic patient anatomy to reconstruct normal tissue doses when CT images of patients are not available. To evaluate the uncertainty involved in the dosimetry approach, we evaluated the esophagus dose in five sample patients by simulating breast cancer treatments. METHODS: We obtained the diagnostic CT images of five anonymized adult female patients in different Body Mass Index (BMI) categories (16- 36kg/m2) from National Institutes of Health Clinical Center...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048098/su-f-j-67-dosimetric-changes-during-radiotherapy-in-lung-cancer-patients-with-atelectasis
#13
C Guy, E Weiss, N Jan, L Reshko, G Christensen, G Hugo
PURPOSE: Large geometric changes which occur during thoracic radiotherapy alter normal anatomy and target position and may induce clinically important dose changes. This study investigates variation of organ-at-risk (OAR) dose caused by atelectasis resolution during radiotherapy. METHODS: 3D IMRT treatment plans were obtained for 14 non-small-cell lung cancer patients. Dose of the clinical plan was recalculated on a baseline scan in which lung was collapsed and on a midtreatment scan in which lung re-aeration had occurred...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048032/su-f-j-63-abdominal-diameter-changes-in-children-during-volumetric-modulated-arc-therapy-vmat-is-re-planning-needed
#14
F Guerreiro, G Janssens, E Seravalli, B Raaymakers
PURPOSE: To investigate the dosimetric impact of daily changes in patient's diameter, due to weight gain/loss and air in the bowel, based on CBCT information during radiotherapy treatment of pediatric abdominal tumors. METHODS: 10 pediatric patients with neuroblastoma (n=6) and Wilms' (n=4) tumors were included. Available CBCTs were affinely registered to the planning CT for daily set-up variations corrections. A density override approach assigning air-density to the random air pockets and water-density to the remaining anatomy was used to determine the CBCT and CT dose...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047564/su-f-j-221-adjusted-dose-and-its-relation-to-radiation-induced-liver-disease-during-hepatocellular-carcinoma-radiotherapy
#15
P Huang, H Li, J Chen, C Ma, Y Gang, S Qin, Y Yin, D Li
PURPOSE: Many patients with hepatocellular carcinoma (HCC) had hepatic anatomy variations as a result of inter-fraction deformation during fractionated radiotherapy, which may result in difference from the planned dose. This study aimed to investigate the relationship between adjusted dose and radiation induced liver disease (RILD) in HCC patients receiving three dimensional conformal radiotherapy (3DCRT). METHODS: Twenty-three HCC patients received conventional fractionated 3DCRT were enrolled in this retrospective investigation...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047134/th-cd-202-11-implications-for-online-adaptive-and-non-adaptive-radiotherapy-of-gastic-and-gastroesophageal-junction-cancers-using-mri-guided-radiotherapy
#16
K Mittauer, M Geurts, R Toya, M Bassetti, P Harari, B Paliwal, J Bayouth
PURPOSE: Radiotherapy for gastric and gastroesophageal junction (GEJ) tumors commonly requires large margins due to deformation, motion and variable changes of the stomach anatomy, at the risk of increased normal tissue toxicities. This work quantifies the interfraction variation of stomach deformation from daily MRI-guided radiotherapy to allow for a more targeted determination of margin expansion in the treatment of gastric and GEJ tumors. METHODS: Five patients treated for gastric (n=3) and gastroesophageal junction (n=2) cancers with conventionally fractionated radiotherapy underwent daily MR imaging on a clinical MR-IGRT system...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046836/we-fg-202-08-assessment-of-treatment-response-via-longitudinal-diffusion-mri-on-a-mri-guided-system-initial-experience-of-quantitative-analysis
#17
X Qi, Y Yang, L Yang, D Low, K Sheng
PURPOSE: To report our initial experience of systematic monitoring treatment response using longitudinal diffusion MR images on a Co-60 MRI-guided radiotherapy system. METHODS: Four patients, including 2 head-and-necks, 1 sarcoma and 1 GBM treated on a 0.35 Tesla MRI-guided treatment system, were analyzed. For each patient, 3D TrueFISP MRIs were acquired during CT simulation and before each treatment for treatment planning and patient setup purposes respectively...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28028693/a-study-of-coronary-bifurcation-shape-in-a-normal-population
#18
Pau Medrano-Gracia, John Ormiston, Mark Webster, Susann Beier, Chris Ellis, Chunliang Wang, Örjan Smedby, Alistair Young, Brett Cowan
During percutaneous coronary intervention, stents are placed in narrowings of the arteries to restore normal blood flow. Despite improvements in stent design, deployment techniques and drug-eluting coatings, restenosis and stent thrombosis remain a significant problem. Population stent design based on statistical shape analysis may improve clinical outcomes. Computed tomographic (CT) coronary angiography scans from 211 patients with a zero calcium score, no stenoses and no intermediate artery, were used to create statistical shape models of 446 major coronary artery bifurcations (left main, first diagonal and obtuse marginal and right coronary crux)...
December 27, 2016: Journal of Cardiovascular Translational Research
https://www.readbyqxmd.com/read/27994427/endodontic-management-of-maxillary-first-molar-with-atypical-canal-morphology-report-of-three-cases
#19
Osama Adeel Khan Sherwani, Bhumika Kapoor, Rajat Sharma, Surendra Kumar Mishra
Maxillary first molar with three roots and 3-4 canals is a common occurrence. However, extreme variations in their canal morphology have been reported ranging from one single canal and one root to as many as eight root canals. This article presents three cases of successful endodontic management of maxillary first molars with atypical canal morphologies, thus highlighting the fact that variations do occur and an endodontist should always be aware of aberrancies in root canal system apart from the knowledge of normal root canal anatomy...
October 2016: Contemporary Clinical Dentistry
https://www.readbyqxmd.com/read/27957314/the-relationship-between-anterior-chamber-depth-axial-length-and-intraocular-lens-power-among-candidates-for-cataract-surgery
#20
Mohammad Reza Sedaghat, Ali Azimi, Peyman Arasteh, Naghmeh Tehranian, Shahram Bamdad
INTRODUCTION: Basic anatomical parameters in ophthalmology are variable in different countries according to ethnic groups, genetics and some environmental factors. The aim of this study was to determine the relationship between axial length (AL), anterior chamber depth (ACD) and intraocular lens power (IOL) in a referral center from eastern Iran among patients who had cataract surgery, in comparison to studies from other regions of the world. METHODS: In a cross-sectional retrospective study from 2011 to 2013, the records of 698 cataract patients referring to Khatam Al Anbia general hospital in Mashhad, Iran were evaluated...
October 2016: Electronic Physician
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