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https://www.readbyqxmd.com/read/28432914/adaptive-optimization-of-ultrasound-beamforming-sound-velocity-using-sub-aperture-differential-phase-gradient
#1
Che-Chou Shen, Hsiao-Chi Yang
Ultrasound array imaging systems rely on a presumed beamforming sound velocity to calculate the time compensation of each element for receive focusing. The mismatch between the tissue sound velocity and the beamforming sound velocity can degrade the focusing quality due to loss of phase coherence. Since the tissue sound velocity cannot be known in prior, an adaptive optimization of beamforming sound velocity is required to improve the image quality. Differential phase gradient of channel data is proposed to estimate the optimal sound velocity for beamforming...
April 12, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28432675/transoral-thyroidectomy-advantages-and-limitations
#2
G Dionigi, R P Tufano, J Russell, H Y Kim, E Piantanida, A Anuwong
In this opinion paper of the Journal of Endocrinological Investigation, leading experts in the field report on their current clinical experience with a novel approach for thyroid gland surgery, namely, "transoral thyroidectomy" (TOT). This feasible and novel surgical procedure does not require visible incisions and is, therefore, a truly scarless surgery. Patients meeting the following criteria can be considered as candidates for TOT: (a) an ultrasonographically (US) estimated thyroid diameter ≤10 cm; (b) US-estimated gland volume ≤45 mL; (c) nodule size ≤50 mm; (d) presence of a benign tumor such as a thyroid cyst or a single- or multi-nodular goiter; (e) Bethesda 3 and/or 4 category and (f) papillary microcarcinoma without the evidence of metastasis...
April 21, 2017: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/28432469/renal-findings-in-patients-with-mulibrey-nanism
#3
Johanna Sivunen, Susann Karlberg, Jouko Lohi, Niklas Karlberg, Marita Lipsanen-Nyman, Hannu Jalanko
BACKGROUND: Mulibrey nanism (MUL) is a rare inherited disease caused by genetic defects affecting peroxisomal TRIM37 protein. MUL affects multiple organs, leading to growth retardation and early onset type 2 diabetes. We aimed to characterize the structure and function of kidneys and the urinary tract in a large cohort of Finnish MUL patients. METHODS: Ultrasound, magnetic resonance imaging (MRI), and autopsy findings of the kidneys and urinary tract from 101 MUL patients were retrospectively analyzed...
April 22, 2017: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/28432447/twofold-minimum-variance-beamforming-for-enhanced-ultrasound-imaging
#4
Sayed Mahmoud Sakhaei, Seyede Elham Shamsian
PURPOSE: To calculate the optimal weights of a minimum variance (MV) beamformer, the covariance matrix of the received data should be estimated. In ultrasound imaging, it is done through spatial smoothing. However, this technique reduces the effective aperture and consequently limits the attainable resolution. To mitigate this effect, we propose a new configuration for applying an adaptive beamforming method. METHODS: The method is based on applying MV in a twofold configuration such that the outputs of the subarrays are combined through an adaptive MV-like beamformer, instead of simply summing them...
April 21, 2017: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/28432106/prohibitin-induced-obesity-leads-to-anovulation-and-polycystic-ovary-in-mice
#5
Sudharsana Rao Ande, Khanh Hoa Nguyen, Yang Xin Zi Xu, Suresh Mishra
Polycystic ovary syndrome (PCOS) is a prevalent endocrine disorder and the most common cause of female infertility. However, the etiology of the disease and the mechanisms by which this disorder progress remain unclear. Here we report that a transgenic obese mouse (Mito-Ob) developed by overexpressing prohibitin in adipocytes develops polycystic ovaries. Initially, the female Mito-Ob mice were equally fertile to their wild-type littermates. Mito-Ob mice begin to gain weight after puberty, become significantly obese between 3-6 months of age, and roughly 25% of them become infertile by 9 months of age...
April 21, 2017: Biology Open
https://www.readbyqxmd.com/read/28432012/novel-compound-heterozygous-mutations-in-the-pex1-gene-in-two-chinese-newborns-with-zellweger-syndrome-based-on-whole-exome-sequencing
#6
Meng-Meng Ge, LiYuan Hu, ZhiHua Li, GuoQiang Cheng, Kai Yan, YanTing Kong, HuiJun Wang, Lin Yang, WenHao Zhou
Peroxisome biogenesis disorders (PBDs) represent a spectrum of human genetic disorders that are characterized by damaged peroxisome assembly. In the newborn period, the characteristics of affected patients include dysmorphic facial features, neonatal hypotonia, seizures, ocular abnormalities, poor feeding, liver cysts with hepatic dysfunction and skeletal defects. These can be caused by a defect in at least 14 different PEX genes. In this study, whole-exome sequencing (WES) was performed on samples from two Chinese newborns with clinical features of Zellweger syndrome...
April 18, 2017: Clinica Chimica Acta; International Journal of Clinical Chemistry
https://www.readbyqxmd.com/read/28430735/sodium-tetradecyl-sulfate-a-review-of-clinical-uses
#7
Helena A Jenkinson, Kelly M Wilmas, Sirunya Silapunt
BACKGROUND: Sodium tetradecyl sulfate (STS) is Food and Drug Administration approved for treatment of varicose veins, but numerous other off-label applications have been reported. OBJECTIVE: To describe the clinical uses of STS, as well as efficacy and adverse effects. METHODS: Review of studies searchable on PubMed from 1938 to 2016 describing clinical uses of STS to determine efficacy and adverse effects associated with various applications...
April 19, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/28430075/considerations-in-the-management-of-congenital-cranial-dermoid-cysts
#8
Syed Khalid, John Ruge
OBJECTIVE Congenital dermoid cysts (CDCs) develop from the entrapment of the surface ectoderm along the lines of embryonic fusion and have a capacity to grow. Given this capacity for continual expansion, the timing of removal and anticipation of possible epidural extension is important. METHODS The authors retrospectively reviewed records of patients with the diagnosis of dermoid cyst presenting over a period of 10 years. Baseline characteristics, histological reports, and surgical records were collected and analyzed...
April 21, 2017: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/28429952/rare-cases-imitating-acute-appendicitis-three-case-reports-and-a-review-of-literature
#9
L Kunovsky, Z Kala, L Mitas, V Can, J Dolina, E Nemcová, L Klvacova, T Gajdosova, I Penka
Acute appendicitis with its characteristic clinical course is one of the most common diagnoses that require urgent surgery. The following three case reports present patients with symptoms typical of acute appendicitis which was, however, not confirmed intraoperatively. Preoperative CT or MRI were not requested because symptoms clearly indicated acute appendicitis. The first case describes a male patient with right-sided diverticulitis, the second case report involves a pregnant woman in 33rd week of gestation with right adnexal torsion due to a dermoid cyst, and in the last report, a case of spontaneous perforation of appendiceal mucinous neoplasm is presented...
2017: Rozhledy V Chirurgii: Měsíčník Československé Chirurgické Společnosti
https://www.readbyqxmd.com/read/28429278/-trans-hepatico-cystic-coledochostomy-for-the-opening-hydatid-cyst-in-the-biliary-tract-indications-and-outcome-evaluation-of-25-cases
#10
S Daldoul, G H El Kebir, I Messoudi, A Mabrouk, M Tahar Bouzidi, M Ben Moussa
The treatment of hydatid cysts of the liver opened in the bile ducts is sometimes difficult and complex. The trans-hepaticocystic coledochostomy (CTHK) is one of these processes. We conducted a review of the indications for this surgical procedure and its perioperative outcomes through a series of 25 patients and then we analyzed predictor factors of complications. During the period's study, 909 patients with liver hydatid cyst went under the surgery. Ninety two (92, i.e. 10.1%) of them had an opening in the bile ducts through a large fistula...
April 20, 2017: Bulletin de la Société de Pathologie Exotique
https://www.readbyqxmd.com/read/28429039/-true-thymic-hyperplasia-differential-diagnosis-of-thymic-mass-lesions-in-neonates-and-children
#11
C-A Weis, B Märkl, T Schuster, K Vollert, P Ströbel, A Marx
Reactive and neoplastic thymic pathologies are the main considerations in the case of masses in the anterior and middle part of the mediastinum, while neurogenic tumors are predominant in the posterior mediastinum (which are not dealt with here). In neonates and infants, the commonest pathologies in the anterior mediastinum comprise germ cell tumors (mainly teratomas), congenital thymic cysts and true thymic hyperplasia (TTH). In toddlers, teratomas, yolk sac tumors and cysts predominate. In children over 5 years of age, lymphomas are the commonest mass lesions whereas thymomas and thymic carcinomas are rare...
April 20, 2017: Der Pathologe
https://www.readbyqxmd.com/read/28428006/the-relation-between-the-location-and-the-perforation-rate-of-lung-hydatid-cysts-in-children
#12
Omer Onal, Omer Faruk Demir
BACKGROUND/OBJECTIVE: The pressure, size, and central or peripheral location of lung hydatid cysts are the most studied topics among the factors affecting perforation. The aim of this study is to investigate the relation between the location and the perforation rate of lung hydatid cysts in children. METHODS: 197 patients under the age of 16 years, who were operated between January 2000 and December 2016 due to pulmonary hydatid cysts, were evaluated retrospectively...
April 17, 2017: Asian Journal of Surgery
https://www.readbyqxmd.com/read/28427982/preoperative-evaluation-of-sellar-and-parasellar-macro-lesions-by-fluorine-18-fluorodeoxyglucose-positron-emission-tomography
#13
Masahiko Tosaka, Tetsuya Higuchi, Keishi Horiguchi, Tadashi Osawa, Yukiko Arisaka, Haruyasu Fujita, Yoshito Tsushima, Yuhei Yoshimoto
OBJECTIVE: Various pathologies can occur in the sellar and suprasellar regions. The potential of fluorine-18 fluorodeoxyglucose (FDG) positron emission tomography (PET) for the preoperative evaluation of sellar and parasellar lesions was investigated. METHODS: A total of 49 patients aged 8 to 82 years with sellar and parasellar macroscopic lesions (≥10 mm) underwent FDG PET. Twenty-two patients had pituitary adenomas, including 14 non-functioning and 8 growth hormone (GH)-secreting adenomas...
April 17, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28427981/ultrastructure-of-pericystic-or-intracystic-blood-vessels-in-epidermoid-cysts-a-transmission-electron-microscopy-study-laboratory-investigation
#14
Xiao-Hui Ren, Jun Ma, Chun Zeng, Yi-Lin Sun, Song Lin
OBJECTIVES: Recently, we reported the tendency towards the spontaneous hemorrhage in both pre- and post-operative periods of patients with intracranial epidermoid cyst (EC). According to our experience this tendency of spontaneous hemorrhage was partly due to the pathologic blood vessels adjacent to the EC. This article was designed to testify this hypothesis. MATERIALS & METHODS: 23 removable pericystic or intracystic blood vessels from 17 EC patients were collected during surgery, and then were examined by transmission electron microscope...
April 17, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28427752/spontaneously-arising-tumours-and-tumour-like-lesions-of-the-cervix-and-uterus-in-83-pet-guinea-pigs-cavia-porcellus
#15
C Laik-Schandelmaier, R Klopfleisch, S Schöniger, G Weiffenbach, M Staudacher, H Aupperle
Tumours and tumour-like lesions are rare findings in the genital system of guinea pigs. The aim of the present study was to characterize nodular lesions in the cervix and uterus of guinea pigs submitted for histopathological diagnosis. Samples from 83 pet animals were investigated. Cases included 64 surgically excised masses including complete uteri (n = 37), parts from uteri containing masses (n = 8), complete masses (n = 12) or samples from masses (n = 7) and 19 complete necropsy examinations. In 55 of the cases, only solitary changes were observed; in 28 cases two or more lesions were diagnosed...
April 17, 2017: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28427062/emerging-issues-for-optical-coherence-tomography
#16
Luisa Pierro, Alessandro Rabiolo
Almost 25 years after its introduction, optical coherence tomography (OCT) is still a crucial test in the evaluation of patients affected by diabetic retinopathy. In this chapter, the authors provide an extensive overview of the posterior segment pathological changes induced by diabetes, characterized using OCT. OCT plays a key role in diabetic macular edema (DME) as it assesses related retinal changes both in a qualitative (i.e., DME pattern, presence and aspects of cysts, fluid localization, integrity, and reflectivity of retinal layers) and quantitative (i...
2017: Developments in Ophthalmology
https://www.readbyqxmd.com/read/28426417/neuropathological-lesions-of-clinical-and-sub-clinical-coenurosis-coenurus-cerebralis-in-organized-goat-farms-in-india
#17
Nayakwadi Shivasharanappa, Nitika Sharma, Dinesh Kumar Sharma, Rajveer Singh Pawaiya, Beena Vamadevan, Anil Kumar Mishra, Souvik Paul
Clinical and sub clinical cases of Coenurosis due to Coenurus cerebralis in goats were documented based on clinical, post mortem examination, identification of parasitic stages, gross and histopathological lesions in brain of animals died due to abnormal neurological symptoms. The most prominent site of predilection of coenuri cysts in brain was cerebral hemispheres and multiple cysts were found in majority of the cases. Generalized congestion, thinning of brain parenchyma due to pressure atrophy, gliosis, neuronal degeneration, protoscolices in brain parenchyma and inflammatory cell reactions predominantly comprised of lymphocytes and macrophages were prominent neuropathological lesions observed in brain...
June 1, 2017: Acta Parasitologica
https://www.readbyqxmd.com/read/28425757/the-prevalence-and-characteristics-of-a-subcortical-cystic-lesion-at-the-subspinous-region-of-the-knee
#18
Ji Ye Son, Young Cheol Yoon, Wook Jin, Jang Gyu Cha
Background Although we observed that subcortical cysts near the attachment of the meniscus or cruciate ligaments are frequently seen with a tear or degeneration of the adjacent meniscus and/or cruciate ligament, there is no large study describing the prevalence, distribution, and associated findings of these cysts. Purpose To evaluate the prevalence and distribution of subcortical cysts near the attachments of the meniscus or cruciate ligaments and evaluate pathologies of the meniscus or cruciate ligaments using magnetic resonance imaging (MRI)...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28425414/cholangiohydatidosis-an-infrequent-cause-of-obstructive-jaundice-and-acute-cholangitis
#19
Carlos Manterola, Tamara Otzen
BACKGROUND: One of the evolutionary complications of hepatic echinococcosis (HE) is cholangiohydatidosis, a rare cause of obstructive jaundice and cholangitis. The aim of this study was to describe the results of surgical treatment on a group of patients with cholangiohydatidosis and secondary cholangitis in terms of post-operative morbidity (POM). MATERIAL AND METHOD: Case series of patients operated on for cholangiohydatidosis and cholangitis in the Department at Surgery of the Universidad de La Frontera and the Clínica Mayor in Temuco, Chile between 2004 and 2014...
May 2017: Annals of Hepatology
https://www.readbyqxmd.com/read/28424917/cubital-tunnel-syndrome-caused-by-ganglion-cysts-a-review-of-59-cases
#20
Jinsong Tong, Bin Xu, Zhen Dong, Jingbo Liu, Chenggang Zhang, Yudong Gu
BACKGROUND: Cubital tunnel syndrome caused by ganglion cysts is rare and reports are few. This study aimed to review a patient cohort with ganglion cysts in the cubital tunnel and identify prognostic factors. METHODS: Fifty-seven patients (59 extremities; McGowan grade I, 4; IIa, 4; IIb, 3; III, 48) were evaluated retrospectively with a minimum follow-up of 2 years. Extraneural cysts were excised completely, while intraneural cysts were incised and drained. All cases underwent subcutaneous transposition...
April 19, 2017: Acta Neurochirurgica
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