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Liver anatomy

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https://www.readbyqxmd.com/read/28635614/advanced-treatment-planning-using-direct-4d-optimisation-for-pencil-beam-scanned-particle-therapy
#1
Kinga Bernatowicz, Ye Zhang, Rosalind Lucy Perrin, Damien Charles Weber, Antony John Lomax
We report on development of a new four-dimensional (4D) optimisation approach for scanned proton beams, which incorporates both irregular motion patterns and the delivery dynamics of the treatment machine into the plan optimiser. Furthermore, we assess the effectiveness of this technique to reduce dose to critical structures in proximity to moving targets, while maintaining effective target dose homogeneity and coverage. The proposed approach has been tested using both a simulated phantom and a clinical liver cancer case, and allows for realistic 4D calculations and optimisation using irregular breathing patterns extracted from e...
June 21, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28634319/common-hepatic-artery-quadrifurcation-associated-with-right-hepatic-artery-from-superior-mesenteric-artery-during-laparoscopic-total-splenopancreasectomy
#2
Francesco Caruso, Giorgio Alessandri, Francesca Ciccarese, Giovanni Cesana, Matteo Uccelli, Giorgio Castello, Roberta Villa, Stefano Olmi
Hepatobiliopancreatic surgery is challenging becouse of the complexity of resections and reconstructions and variability of vascular anatomy. The arterial vascularization of the liver is susteined by the common hepatic artery (CHA) that originates from the celiac trunk (CT). The CHA bifurcates into the gastroduodenal artery (GDA) and proper hepatic artery (PHA) 0.5-1 cm medial to the common bile duct (CBD), and the PHA bifurcates into a right and a left branch at hepatic hilum. The most frequent variants are the right hepatic artery (RHA) from the superior mesenteric artery (SMA), the left hepatic artery (LHA) from the left gastric artery (LGA) or a combination of these two variants...
June 12, 2017: Annali Italiani di Chirurgia
https://www.readbyqxmd.com/read/28621295/efficacy-and-safety-in-case-of-technical-success-of-endoscopic-ultrasound-guided-transhepatic-antegrade-biliary-drainage-a-report-of-a-monocentric-study
#3
Sébastien Godat, Erwan Bories, Fabrice Caillol, Christian Pesenti, Jean Philippe Ratone, Chiara de Cassan, Marc Giovannini
BACKGROUND AND OBJECTIVES: Endoscopic ultrasound (EUS)-guided biliary drainage techniques are alternative procedures in cases of obstructive jaundice with altered anatomy or failed ERCP. Complications related to EUS-guided antegrade drainage (EUS-AD) are still present in up to 10% of cases, and combination of procedures is sometimes suggested to avoid adverse events. The purpose of our study is to evaluate the efficacy and safety of EUS-AD with transhepatic access in case of technical success...
May 2017: Endoscopic Ultrasound
https://www.readbyqxmd.com/read/28614587/scholars-and-scientists-in-the-history-of-the-lymphatic-system
#4
REVIEW
Gianfranco Natale, Guido Bocci, Domenico Ribatti
The discovery of the lymphatic system has a long and fascinating history. The interest in anatomy and physiology of this system paralleled that of the blood cardiocirculatory system and has been maybe obscured by the latter. Paradoxically, if the closed blood system appeared open in Galen's anatomy and physiology, and took a very long time to be correctly described in terms of pulmonary and general circulation by ibn Al-Nafis/Michael Servetus/Realdo Colombo and William Harvey, respectively, the open lymphatic system was incorrectly described as a closed circuit connected with arteries and veins...
June 14, 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/28599825/left-ventricular-rotational-and-twist-mechanics-in%C3%A2-the-human-fetal-heart
#5
Ling Li, Mary Craft, Hao H Hsu, Ming Zhang, Berthold Klas, David A Danford, Shelby Kutty
BACKGROUND: The authors investigated left ventricular (LV) rotational indices, twist, and torsion in a large cohort of fetuses using two-dimensional speckle-tracking echocardiography. METHODS: Pregnant women (N = 102) were prospectively recruited for fetal two-dimensional speckle-tracking echocardiography. Because of variable fetal position, ventricular orientation was established using the location of the liver and LV position in relation to the right ventricle...
June 6, 2017: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/28593709/respiratory-motion-model-based-on-the-noise-covariance-matrix-of-a-receive-array
#6
A Andreychenko, B Denis de Senneville, R J M Navest, R H N Tijssen, J J W Lagendijk, C A T van den Berg
PURPOSE: Tracking of the internal anatomy by means of a motion model that uses the MR-derived motion fields and noise covariance matrix (NCM) dynamic as a surrogate signal. METHODS: A 2D respiratory motion model was developed based on the MR-derived motion fields and the NCM of a receive array used in MRI. Temporal dynamics of the NCM were used as a motion surrogate for a linear correspondence motion model. The model performance was tested on five healthy volunteers with a liver as the target...
June 7, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28591031/ct-evaluation-of-living-liver-donor-can-100-kvp-plus-iterative-reconstruction-protocol-provide-accurate-liver-volume-and-vascular-anatomy-for-liver-transplantation-with-reduced-radiation-and-contrast-dose
#7
Morikatsu Yoshida, Daisuke Utsunomiya, Masafumi Kidoh, Hideaki Yuki, Seitaro Oda, Shinya Shiraishi, Hidekazu Yamamoto, Yukihiro Inomata, Yasuyuki Yamashita
We evaluated whether donor computed tomography (CT) with a combined technique of lower tube voltage and iterative reconstruction (IR) can provide sufficient preoperative information for liver transplantation.We retrospectively reviewed CT of 113 liver donor candidates. Dynamic contrast-enhanced CT of the liver was performed on the following protocol: protocol A (n = 70), 120-kVp with filtered back projection (FBP); protocol B (n = 43), 100-kVp with IR. To equalize the background covariates, one-to-one propensity-matched analysis was used...
June 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28588749/strategies-to-tackle-the-challenges-of-external-beam-radiotherapy-for-liver-tumors
#8
REVIEW
Michael I Lock, Jonathan Klein, Hans T Chung, Joseph M Herman, Edward Y Kim, William Small, Nina A Mayr, Simon S Lo
Primary and metastatic liver cancer is an increasingly common and difficult to control disease entity. Radiation offers a non-invasive treatment alternative for these patients who often have few options and a poor prognosis. However, the anatomy and aggressiveness of liver cancer poses significant challenges such as accurate localization at simulation and treatment, management of motion and appropriate selection of dose regimen. This article aims to review the options available and provide information for the practical implementation and/or improvement of liver cancer radiation programs within the context of stereotactic body radiotherapy and image-guided radiotherapy guidelines...
May 18, 2017: World Journal of Hepatology
https://www.readbyqxmd.com/read/28586581/difficulties-in-laparoscopic-cholecystectomy-conversion-versus-surgeon-s-failure
#9
Aun Ali, Summaya Saeed, Rabel Khawaja, Sunil Sadruddin Samnani, Farah Naz Farid
OBJECTIVE: Laparoscopic cholecystectomy is considered to be gold standard treatment for symptomatic gall stones. Despite several benefits there are still disadvantages of laparoscopic cholecystectomy in difficult cases where anatomy is disturbed even in experienced hand. Aim of this study is to identify advantages of early conversion to open cholecystectomy in difficult cases and how it should not be associated with surgeon's failure. METHODS: Observational study was conducted at tertiary care hospital of Karachi, Pakistan from January 2012 till June 2015...
October 2016: Journal of Ayub Medical College, Abbottabad: JAMC
https://www.readbyqxmd.com/read/28580726/the-first-case-of-domino-split-liver-transplantation-in-maple-syrup-urine-disease
#10
Uta Herden, Jun Li, Lutz Fischer, Florian Brinkert, Martin Blohm, René Santer, Bjoern Nashan, Enke Grabhorn
The enzymatic defect in MSUD results in accumulation of neurotoxic metabolites of BCAAs. LTX has shown to be a feasible strategy in patients non-responsive to diet. Because of sufficient enzyme activity in extrahepatic tissues in healthy people, the MSUD liver graft is a suitable domino organ. We present the first case of a technical challenging ex situ split of a MSUD domino organ transplanted into two pediatric recipients. The domino graft donor was a 21-year-old female (58 kg) suffering from MSUD with recurrent metabolic decompensation despite strict diet...
June 5, 2017: Pediatric Transplantation
https://www.readbyqxmd.com/read/28574801/direct-gallbladder-indocyanine-green-injection-fluorescence-cholangiography-during-laparoscopic-cholecystectomy
#11
Claire Graves, Sora Ely, Olajire Idowu, Christopher Newton, Sunghoon Kim
BACKGROUND: Intravenous injection of indocyanine green (ICG) is used to illuminate extrahepatic biliary anatomy. Fluorescence of biliary structures may lower surgical complications that can arise due to inadvertent injury to the common bile duct. We describe a method of injecting ICG directly into the gallbladder to define the cystic duct and common bile duct anatomy. MATERIALS AND METHODS: A standard laparoscopic cholecystectomy was performed using a laparoscope with near-infrared imaging capability...
June 2, 2017: Journal of Laparoendoscopic & Advanced Surgical Techniques. Part A
https://www.readbyqxmd.com/read/28541191/fast-numerical-simulation-of-focused-ultrasound-treatments-during-respiratory-motion-with-discontinuous-motion-boundaries
#12
Michael Schwenke, Joachim Georgii, Tobias Preusser
OBJECTIVE: Focused ultrasound (FUS) is rapidly gaining clinical acceptance for several target tissues in the human body. Yet, treating liver targets is not clinically applied due to a high complexity of the procedure (noninvasiveness, target motion, complex anatomy, blood cooling effects, shielding by ribs, and limited image-based monitoring). To reduce the complexity, numerical FUS simulations can be utilized for both treatment planning and execution. These use-cases demand highly accurate and computationally efficient simulations...
July 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28530492/3d-printing-in-liver-surgery-a-systematic-review
#13
Jan Sylwester Witowski, Jasamine Coles-Black, Tomasz Zbigniew Zuzak, Michał Pędziwiatr, Jason Chuen, Piotr Major, Andrzej Budzyński
BACKGROUND: Rapid growth of three-dimensional (3D) printing in recent years has led to new applications of this technology across all medical fields. This review article presents a broad range of examples on how 3D printing is facilitating liver surgery, including models for preoperative planning, education, and simulation. MATERIALS AND METHODS: We have performed an extensive search of the medical databases Ovid/MEDLINE and PubMed/EMBASE and screened articles fitting the scope of review, following previously established exclusion criteria...
May 22, 2017: Telemedicine Journal and E-health: the Official Journal of the American Telemedicine Association
https://www.readbyqxmd.com/read/28497761/beyond-the-milan-criteria-for-liver-transplantation-in-children-with-hepatic-tumours
#14
Jean de Ville de Goyet, Rebecka L Meyers, Greg M Tiao, Bruce Morland
The Milan criteria were originally defined in the context of adult liver transplantation for patients with hepatocellular carcinoma and cirrhotic livers. The aim of the criteria was to select patients with small tumours and no disease spread who had a good chance of success, thus avoiding futile transplants. This objective was reached successfully. For the management of selected children with unresectable hepatoblastoma, an almost opposite strategy was proposed and has been implemented in the past two decades, in which transplantation is indicated on the basis of large tumour size and anatomy that precludes the possibility of safe and radical resection...
June 2017: Lancet. Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/28489166/anatomic-variations-of-hepatic-artery-a-study-in-479-liver-transplantations
#15
Olival Cirilo Lucena da Fonseca-Neto, Heloise Caroline de Souza Lima, Priscylla Rabelo, Paulo Sérgio Vieira de Melo, Américo Gusmão Amorim, Cláudio Moura Lacerda
Background: The incidence of anatomic variations of hepatic artery ranges from 20-50% in different series. Variations are especially important in the context of liver orthotopic transplantation, since, besides being an ideal opportunity for surgical anatomical study, their precise identification is crucial to the success of the procedure. Aim: To identify the anatomical variations in the hepatic arterial system in hepatic transplantation. Methods: 479 medical records of transplanted adult patients in the 13-year period were retrospectively analyzed, and collected data on hepatic arterial anatomy of the deceased donor...
January 2017: Arquivos Brasileiros de Cirurgia Digestiva: ABCD, Brazilian Archives of Digestive Surgery
https://www.readbyqxmd.com/read/28481229/parenteral-nutrition-and-intestinal-failure
#16
REVIEW
Barbara Bielawska, Johane P Allard
Severe short bowel syndrome (SBS) is a major cause of chronic (Type 3) intestinal failure (IF) where structural and functional changes contribute to malabsorption and risk of micronutrient deficiencies. Chronic IF may be reversible, depending on anatomy and intestinal adaptation, but most patients require long-term nutritional support, generally in the form of parenteral nutrition (PN). SBS management begins with dietary changes and pharmacologic therapies taking into account individual anatomy and physiology, but these are rarely sufficient to avoid PN...
May 6, 2017: Nutrients
https://www.readbyqxmd.com/read/28474177/evaluation-of-biliary-ductal-anatomy-in-potential-living-liver-donors-comparison-between-mrcp-and-gd-eob-dtpa-enhanced-mri
#17
D Santosh, A Goel, I W Birchall, A Kumar, K H Lee, V H Patel, G Low
PURPOSE: To compare magnetic resonance cholangiopancreatography (MRCP) and Gd-EOB-DTPA-enhanced MRI in the evaluation of the biliary anatomy in potential living liver donors (LLDs). METHODS: A retrospective study was conducted in a tertiary care liver transplant center after obtaining ethics and institutional approvals. A total of 42 potential LLD MRI examinations were performed between November 2013 and March 2016. All patients underwent a standard MRI protocol which included MRCP and Gd-EOB-DTPA-enhanced MRI sequences in a single session...
May 4, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28466969/microscopic-anatomy-of-the-visceral-fasciae
#18
Carla Stecco, Maria Martina Sfriso, Andrea Porzionato, Anna Rambaldo, Giovanna Albertin, Veronica Macchi, Raffaele De Caro
The term 'visceral fascia' is a general term used to describe the fascia lying immediately beneath the mesothelium of the serosa, together with that immediately surrounding the viscera, but there are many types of visceral fasciae. The aim of this paper was to identify the features they have in common and their specialisations. The visceral fascia of the abdomen (corresponding to the connective tissue lying immediately beneath the mesothelium of the parietal peritoneum), thorax (corresponding to the connective tissue lying immediately beneath the mesothelium of the parietal pleura), lung (corresponding to the connective tissue under the mesothelium of the visceral pleura), liver (corresponding to the connective tissue under the mesothelium of the visceral peritoneum), kidney (corresponding to the Gerota fascia), the oesophagus (corresponding to its adventitia) and heart (corresponding to the fibrous layer of the pericardial sac) from eight fresh cadavers were sampled and analysed with histological and immunohistochemical stains to evaluate collagen and elastic components and innervation...
May 3, 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/28464747/cone-beam-ct-based-set-up-strategies-with-and-without-rotational-correction-for-stereotactic-body-radiation-therapy-in-the-liver
#19
Jenny Bertholet, Esben Worm, Morten Høyer, Per Poulsen
BACKGROUND: Accurate patient positioning is crucial in stereotactic body radiation therapy (SBRT) due to a high dose regimen. Cone-beam computed tomography (CBCT) is often used for patient positioning based on radio-opaque markers. We compared six CBCT-based set-up strategies with or without rotational correction. MATERIAL AND METHODS: Twenty-nine patients with three implanted markers received 3-6 fraction liver SBRT. The markers were delineated on the mid-ventilation phase of a 4D-planning-CT...
June 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28461180/giant-symptomatic-aneurysm-secondary-to-hereditary-hemorrhagic-telangiectasia-of-a-main-hepatic-artery-with-aberrant-origin-in-superior-mesenteric-artery
#20
Francisco Javier Peinado Cebria N, Santiago Este Banez Seco, A Ngel Flores-Herrero, Ricardo Montoya Ching, Benito Mendez Feria, Diego Soto Valdés, Maria Pilar Lamarca Mendoza, Antonio Orgaz Pe Rez-Grueso
INTRODUCTION: Hereditary Hemorragic Telangiectasia (HHT) is a rare disease consistent in vascular dysplasias affecting different organs. Liver involvement includes telangiectases, arteriovenous shunting, and ischemic cholangitis, and its prevalence ranges from 8 to 31%. Spontaneous pseudo aneurysms have never been reported associated to HHT. Several variations in the origin of the main hepatic artery (MHA) have been described in large radiological series, and can be found in around 4% of general population...
April 28, 2017: Annals of Vascular Surgery
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