342 results match your criteria fluid-filled structure

The functional limits of the aneurysmal aortic root. A unique pressure testing apparatus.

J Cardiothorac Surg 2020 Sep 17;15(1):259. Epub 2020 Sep 17.

Cardiology Department, Queen Elizabeth Hospital, Adelaide, South Australia.

Background: The aortic root has unique embryological development and is a highly sophisticated and complex structure. In studies that report on the biomechanical characteristics of the thoracic aorta, distinction between the aortic root and ascending aorta regions is nonexistent. Our objective is to determine the maximal pressures at which dissection occurs or tissue failure occurs in the aortic root compared to that of the ascending aorta in the presence of aortic aneurysms. Read More

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September 2020

Mature Ovarian Cystic Teratoma Mimicking a Bladder Diverticulum in a 16-year-old Female.

Urology 2021 Mar 9;149:e56-e59. Epub 2020 Sep 9.

Children's Hospital of Los Angeles, Division of Pediatric Urology, Los Angeles, CA.

A 16-year-old female was incidentally found to have an abnormal pelvic ultrasound while undergoing evaluation for mild scoliosis. A large, thick-walled, lobular, fluid-filled structure was found at midline in the pelvis that initially resembled bladder diverticula due to its anatomical position and sonographic appearance. Voiding cystourethrogram and computed tomography later revealed a large cystic mass originating from the right ovary. Read More

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High-, Ultrastretchable Self-Enclosed Ionic Liquid-Elastomer Composites for Soft Robotics and Flexible Electronics.

ACS Appl Mater Interfaces 2020 Aug 6;12(33):37561-37570. Epub 2020 Aug 6.

School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore.

Soft robotics focuses on mimicking natural systems to produce dexterous motion. Dielectric elastomer actuators (DEAs) are an attractive option due to their large strains, high efficiencies, lightweight design, and integrability, but require high electric fields. Conventional approaches to improve DEA performance by incorporating solid fillers in the polymer matrices can increase the dielectric constant but to the detriment of mechanical properties. Read More

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Molecular pathways involved in injury-repair and ADPKD progression.

Cell Signal 2020 08 19;72:109648. Epub 2020 Apr 19.

Department of Human Genetics, Leiden University Medical Center, Einthovenweg 20, 2333, ZC, Leiden, the Netherlands. Electronic address:

The major hallmark of Autosomal Dominant Polycystic Kidney Disease (ADPKD) is the formation of many fluid-filled cysts in the kidneys, which ultimately impairs the normal renal structure and function, leading to end-stage renal disease (ESRD). A large body of evidence suggests that injury-repair mechanisms are part of ADPKD progression. Once cysts have been formed, proliferation and fluid secretion contribute to the cyst size increase, which eventually causes stress on the surrounding tissue resulting in local injury and fibrosis. Read More

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Pulsatile flow through idealized renal tubules: Fluid-structure interaction and dynamic pathologies.

Math Biosci Eng 2019 12;17(2):1787-1807

Department of Physics, Cleveland State University, Cleveland OH 44115, USA.

Kidney tubules are lined with flow-sensing structures, yet information about the flow itself is not easily obtained. We aim to generate a multiscale biomechanical model for analyzing fluid flow and fluid-structure interactions within an elastic kidney tubule when the driving pressure is pulsatile. We developed a two-dimensional macroscopic mathematical model of a single fluid-filled tubule corresponding to a distal nephron segment and determined both flow dynamics and wall strains over a range of driving frequencies and wall compliances using finite-element analysis. Read More

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December 2019

Spontaneous Regression of Pineal Region Arachnoid Cyst: A Case Report and Review of Literature.

Asian J Neurosurg 2020 Jan-Mar;15(1):155-158. Epub 2020 Feb 25.

Department of Neurosurgery, King Fahad University Hospital, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia.

Arachnoid cyst is a rare benign cerebrospinal fluid-filled cyst that can develop anywhere in the brain along the arachnoid membrane and usually unaccompanied by the anomalous development of the brain structure. These cysts are usually located in the middle cranial fossa. However, they are also denoted in other regions. Read More

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February 2020

Diagnosis and Surgical Management of a Paratesticular Cyst in a Rehabilitating Juvenile Male Green Turtle ().

Front Vet Sci 2020 27;7:69. Epub 2020 Feb 27.

Georgia Sea Turtle Center/Jekyll Island Authority, Jekyll Island, GA, United States.

A juvenile green turtle () undergoing rehabilitation for cold stunning exhibited an asymmetric bulging of the left caudal plastron and was diagnosed with a large intra-coelomic mass based on radiographical findings. Ultrasonography further identified a fluid-filled structure within the caudal coelom. Cytological evaluation of fluid obtained from the structure was consistent with a transudate, and thus, a cyst of unknown origin was suspected. Read More

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February 2020

An Uncommon Presentation of an Uncommon Bone Tumor: A Case Study of a Pathologic Fracture of an Intertrochanteric Aneurysmal Bone Cyst.

Cureus 2019 Dec 25;11(12):e6461. Epub 2019 Dec 25.

Orthopaedic Surgery, Riverside University Health System Medical Center, Moreno Valley, USA.

Aneurysmal bone cyst (ABC) is a benign, destructive lesion characterized by a expansile fluid-filled cystic structure primarily affecting children and young adults. Common treatment modalities include arterial embolization, curette, intralesional injections and en bloc resection with instrumentation placement. We present the case of a 22-year-old patient presenting to the emergency department with an ABC in the intertrochanteric region of the right femur and a minimally displaced pathologic femoral neck fracture. Read More

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December 2019

Retroperitoneal lymphatic malformation in a dog.

Acta Vet Scand 2020 Feb 1;62(1). Epub 2020 Feb 1.

Department of Soft Tissue Surgery, Willows Veterinary Centre and Referral Service, Highlands Road, Shirley, Solihull, West-Midlands, B90 4NH, UK.

Background: Lymphatic vascular malformations are rare findings in canine patients with six reports available in veterinary literature. Retroperitoneal cystic lymphatic malformations have not been described previously in canine patients and neither has the use of immunohistochemistry to determine their origin, i.e. Read More

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February 2020

Simulations of particle tracking in the oligociliated mouse node and implications for left-right symmetry-breaking mechanics.

Philos Trans R Soc Lond B Biol Sci 2020 02 30;375(1792):20190161. Epub 2019 Dec 30.

School of Mathematics, University of Birmingham, Birmingham B15 2TT UK.

The concept of internal anatomical asymmetry is familiar-usually in humans the heart is on the left and the liver is on the right; however, how does the developing embryo know to produce this consistent laterality? Symmetry-breaking initiates with left-right asymmetric cilia-driven fluid mechanics in a small fluid-filled structure called the ventral node in mice. However, the question of what converts this flow into left-right asymmetric development remains unanswered. A leading hypothesis is that flow transports morphogen-containing vesicles within the node, the absorption of which results in asymmetrical gene expression. Read More

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February 2020

Membrane Transporters in Fruit Juice-Derived Nanovesicles.

Int J Mol Sci 2019 Dec 9;20(24). Epub 2019 Dec 9.

EVs-MS Research Group, Institute of Biosciences and BioResources (IBBR), National Research Council, (CNR), 80131 Napoli, Italy.

The cellular vesicle is a fluid-filled structure separated from the surrounding environment by a biological membrane. Here, we isolated nanovesicles (NVs) from the juice of clementines using a discontinuous density gradient ultracentrifugation method. To gain information about the protein content of vesicles, mass spectrometry-based organelle proteomics and bioinformatics were applied to the exosome-like vesicle fraction isolated in the 1 mol/L sucrose/DO cushion. Read More

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December 2019

Network architecture strongly influences the fluid flow pattern through the lacunocanalicular network in human osteons.

Biomech Model Mechanobiol 2020 Jun 28;19(3):823-840. Epub 2019 Nov 28.

Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, 14476, Potsdam, Germany.

A popular hypothesis explains the mechanosensitivity of bone due to osteocytes sensing the load-induced flow of interstitial fluid squeezed through the lacunocanalicular network (LCN). However, the way in which the intricate structure of the LCN influences fluid flow through the network is largely unexplored. We therefore aimed to quantify fluid flow through real LCNs from human osteons using a combination of experimental and computational techniques. Read More

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Developmental aspects of the tympanic membrane: Shedding light on function and disease.

Genesis 2020 03 25;58(3-4):e23348. Epub 2019 Nov 25.

Centre for Craniofacial and Regenerative Biology, King's College London, Guy's Hospital, London, UK.

The ear drum, or tympanic membrane (TM), is a key component in the intricate relay that transmits air-borne sound to our fluid-filled inner ear. Despite early belief that the mammalian ear drum evolved as a transformation of a reptilian drum, newer fossil data suggests a parallel and independent evolution of this structure in mammals. The term "drum" belies what is in fact a complex three-dimensional structure formed from multiple embryonic cell lineages. Read More

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A perineal cystic hamartoma causing constipation in an intact female Irish water spaniel.

Can Vet J 2019 Nov;60(11):1166-1170

Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, Prince Edward Island C1A 4P3.

A perineal fluid-filled structure was discovered in a 6-year-old intact female Irish water spaniel suffering from intermittent constipation. Diagnostic tests revealed the structure was immediately caudal to the vagina and compatible with a cyst. Surgical excision was required for resolution of clinical signs. Read More

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November 2019

Fetal Death Associated With Premature Mammary Gland Development and Lactation in a Mare Treated With Weekly Injections of Long-Acting Progesterone.

J Equine Vet Sci 2019 10 18;81:102783. Epub 2019 Jul 18.

Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois Urbana-Champaign, Urbana, IL. Electronic address:

A 14-year-old, 530-kg, multiparous, pregnant Quarter Horse mare was referred for evaluation of premature mammary gland development and lactation. The mare was in the seventh month of gestation. The mare had a history of subfertility and was receiving weekly injections of long-acting progesterone, prescribed by the referring veterinarian. Read More

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October 2019

Expression of aquaporins in inner ear disease.

Laryngoscope 2020 06 8;130(6):1532-1539. Epub 2019 Oct 8.

Department of Otorhinolaryngology-Head and Neck Surgery, Graduate School, Kyung Hee University, Seoul, South Korea.

The inner ear is responsible for hearing and balance and consists of a membranous labyrinth within a bony labyrinth. The balance structure is divided into the otolith organ that recognizes linear acceleration and the semicircular canal that is responsible for rotational movement. The cochlea is the hearing organ. Read More

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Imaging of urachal anomalies.

Abdom Radiol (NY) 2019 12;44(12):3978-3989

Department of Radiology, University of Texas Health Science Center at San Antonio, Floyd Curl Drive, 7703, San Antonio, TX, 78229, USA.

Urachal anomalies are classified into four types depending on the level of persistence of the embryonic urachal remnants between the urinary bladder and the umbilicus: patent urachus, umbilical-urachal sinus, urachal cyst, and vesico-urachal diverticulum. Due to the increasing use of cross-sectional imaging, urachal anomalies are frequently detected as incidental findings. Imaging plays a pivotal role in the initial diagnosis, evaluation of complications, treatment follow-up, and long-term surveillance of patients with urachal anomalies. Read More

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December 2019

Comprehensive vibrational dynamics of half-open fluid-filled shells.

Proc Math Phys Eng Sci 2019 Jul 31;475(2227):20190207. Epub 2019 Jul 31.

Science and Math Cluster, Singapore University of Technology and Design (SUTD), 8 Somapah Road, S487372, Singapore.

Fluid-filled shells are near-ubiquitous in natural and engineered structures-a familiar example is that of glass harps comprising partially filled wineglasses or glass bowls, whose acoustic properties are readily noticeable. Existing theories modelling the mechanical properties of such systems under vibrational load either vastly simplify shell geometry and oscillatory modal shapes to admit analytical solutions or rely on finite-element black-box computations for general cases, the former yielding poor accuracy and the latter offering limited tractability and physical insight. In the present study, we derive a theoretical framework encompassing elastic shell deformation with structural and viscous dissipation, accommodating arbitrary axisymmetric shell geometries and fluid levels; reductions to closed-form solutions under specific assumptions are shown to be possible. Read More

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G-Protein-Coupled Estrogen Receptor Agonist G1 Improves Diastolic Function and Attenuates Cardiac Renin-Angiotensin System Activation in Estrogen-Deficient Hypertensive Rats.

J Cardiovasc Pharmacol 2019 11;74(5):443-452

Departments of Anesthesiology.

This study was aimed to clarify differences in how specific agonists of the 3 estrogen receptors (ERs) influence diastolic function and the renin-angiotensin system (RAS) after ovariectomy (OVX) in 24 female spontaneously hypertensive rat (SHR) undergoing bilateral OVX at 12 weeks of age. Eight weeks after surgery, rats were randomized (n = 6/group) to receive equipotent, daily treatments of one of the ER agonists (ERα agonist, propyl pyrazole trisphenol 94 μg/kg; ERβ agonist, diarylpropionitrile 58 μg/kg; G-protein-coupled estrogen receptor [GPER] agonist, G1 100 μg/kg), or vehicle (peanut oil). After 4 weeks of treatment, left ventricular function/structure and systemic/intracardiac pressure measurements were obtained by echocardiography and a fluid-filled catheter attached to a pressure transducer, respectively. Read More

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November 2019

Unicornuate uterus with a rudimentary non-communicating cavitary horn in association with VACTERL association: case report.

BMC Womens Health 2019 05 30;19(1):71. Epub 2019 May 30.

Department of Obstetrics & Gynecology, Faculty of Medicine, Jordan University of Science & Technology, Irbid, Jordan.

Background: The unicornuate uterus is caused by abnormal or failed development of one Müllerian duct. Unicornuate uteri with functioning non-communicating rudimentary horns are susceptible to many gynaecologic and obstetric complications such as hematometra, endometriosis and ectopic pregnancy and thus surgical resection is usually recommended.. Read More

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Dendritic and Synaptic Degeneration in Pyramidal Neurons of the Sensorimotor Cortex in Neonatal Mice With Kaolin-Induced Hydrocephalus.

Front Neuroanat 2019 24;13:38. Epub 2019 Apr 24.

Optics & Imaging Centre, School of Laboratory Medicine and Medical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa.

Obstructive hydrocephalus is a brain disorder in which the circulation of cerebrospinal fluid (CSF) is altered in a manner that causes expansion of fluid-filled intracranial compartments particularly the ventricles. The pyramidal neurons of the sensorimotor cortex are excitatory in nature and their dendritic spines are targets of excitatory synapses. This study evaluated the effect of hydrocephalus on dendritic arborization and synaptic structure of the pyramidal neurons of the sensorimotor cortex of neonatal hydrocephalic mice. Read More

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Inferior lumbar triangle hernia with incarceration.

Am J Emerg Med 2019 06 10;37(6):1218.e5-1218.e6. Epub 2019 Apr 10.

Emergency Department Attending, Ascension St. Joseph's Hospital, Department of Emergency Medicine, 5000 W. Chambers St., Milwaukee, WI 53210, United States of America. Electronic address:

Lumbar hernia is a rare condition in which intra or extraperitoneal tissue protrudes through a defect in the posterolateral region of the flank. Incarceration is uncommon but represents a surgical emergency when present. A 54-year-old-male presented to the ED after sudden onset left flank pain after coughing. Read More

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Structure and function of polycystins: insights into polycystic kidney disease.

Nat Rev Nephrol 2019 07;15(7):412-422

Université Côte d'Azur, Centre National de la Recherche Scientifique, Institut National de la Santé et de la Recherche Médicale, Institut de Pharmacologie Moléculaire et Cellulaire, Labex ICST, Valbonne, France.

Mutations in the polycystins PC1 or PC2 cause autosomal dominant polycystic kidney disease (ADPKD), which is characterized by the formation of fluid-filled renal cysts that disrupt renal architecture and function, ultimately leading to kidney failure in the majority of patients. Although the genetic basis of ADPKD is now well established, the physiological function of polycystins remains obscure and a matter of intense debate. The structural determination of both the homomeric PC2 and heteromeric PC1-PC2 complexes, as well as the electrophysiological characterization of PC2 in the primary cilium of renal epithelial cells, provided new valuable insights into the mechanisms of ADPKD pathogenesis. Read More

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Thermo-viscous damping of acoustic waves in narrow channels: A comparison of effects in air and water.

J Acoust Soc Am 2018 Dec;144(6):3421

School of Mathematics, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom.

Recent work in the acoustic metamaterial literature has focused on the design of metasurfaces that are capable of absorbing sound almost perfectly in narrow frequency ranges by coupling resonant effects to visco-thermal damping within their microstructure. Understanding acoustic attenuation mechanisms in narrow, viscous-fluid-filled channels is of fundamental importance in such applications. Motivated by recent work on acoustic propagation in narrow, air-filled channels, a theoretical framework is presented that demonstrates the controlling mechanisms of acoustic propagation in arbitrary Newtonian fluids, focusing on attenuation in air and water. Read More

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December 2018

Hepatic Hydatid Cyst: A Case Report.

Mymensingh Med J 2018 Oct;27(4):869-871

Dr Fahima Akter Dowel, Medical Officer, Institute of Nuclear Medicine and Allied Sciences (INMAS), Mymensingh, Bangladesh.

Hepatic hydatid disease is a goonotic disease caused by Echinococcus granulosus and it is endemic in different parts of the world. This infection is an important public health problem. Although it is distributed throughout the world but common in the livestock grazing regions of the world such as in Central Europe, Africa, South America, Central Asia and China. Read More

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October 2018

Surgical deroofing in the treatment of patients with auricular pseudocyst.

Auris Nasus Larynx 2019 Aug 20;46(4):576-582. Epub 2018 Nov 20.

Department of Plastic and Reconstructive Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea. Electronic address:

Objective: An auricular pseudocyst is a fluid filled cavity, characterized by a lack of epithelium, in the intra-cartilaginous space. Clinically, it presents as a painless lump on the upper anterior surface of the ear. Various treatment methods have been discussed in the literature, including aspiration, incision and drainage, or steroid injection. Read More

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Minimally Invasive Management of Zinner's Syndrome with Same-Session Robot-Assisted Seminal Vesiculectomy and Ipsilateral Nephroureterectomy Using a Single Geometry of Trocars.

J Endourol Case Rep 2018 7;4(1):186-189. Epub 2018 Nov 7.

Department of Urology, Koc University, Istanbul, Turkey.

Seminal vesicle cyst is an extremely rare condition, which is frequently congenital and associated with Zinner's syndrome. This syndrome represents a constellation of seminal vesicle cyst, ipsilateral or contralateral renal agenesis or renal dysplasia, ureteral ectopia, and ejaculatory duct obstruction. We report a young symptomatic patient undergoing robot-assisted laparoscopic excision of a huge seminal vesicle cyst during which an atrophic ipsilateral kidney was discovered incidentally and managed by nephroureterectomy in the same session without changing trocar positions. Read More

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November 2018