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https://www.readbyqxmd.com/read/28814902/orbital-apex-cyst-a-rare-cause-of-compressive-optic-neuropathy-post-functional-endoscopic-sinus-surgery
#1
Yi Ni Koh, Shu Fen Ho, Letchumanan Pathma, Harvinder Singh, Embong Zunaina
There are various causes that can lead to compressive optic neuropathy. We present here orbital apex cyst as an unusual cause of compressive optic neuropathy in a 49-year-old male. He presented with 2 weeks painless loss of vision in the left eye with left-sided headache. He had had left functional endoscopic sinus surgery for left nasal polyps 4 years earlier. Magnetic resonance imaging of brain and orbit revealed a left discrete orbital nodule, possibly orbital cyst or mucocele, which was compressing on the left optic nerve...
2017: International Medical Case Reports Journal
https://www.readbyqxmd.com/read/28813431/skeleton-of-an-unusual-cat-sized-marsupial-relative-metatheria-marsupialiformes-from-the-middle-eocene-lutetian-44-43-million-years-ago-of-turkey
#2
A Murat Maga, Robin M D Beck
We describe a near-complete, three-dimensionally preserved skeleton of a metatherian (relative of modern marsupials) from the middle Eocene (Lutetian: 44-43 million years ago) Lülük member of the Uzunçarşıdere Formation, central Turkey. With an estimated body mass of 3-4 kg, about the size of a domestic cat (Felis catus) or spotted quoll (Dasyurus maculatus), it is an order of magnitude larger than the largest fossil metatherians previously known from the Cenozoic of the northern hemisphere. This new taxon is characterised by large, broad third premolars that probably represent adaptations for hard object feeding (durophagy), and its craniodental morphology suggests the capacity to generate high bite forces...
2017: PloS One
https://www.readbyqxmd.com/read/28811882/seasonal-changes-in-leaf-chemistry-and-leaf-selection-of-the-japanese-giant-flying-squirrel-upon-two-tree-species
#3
Mutsumi Ito, Noriko Tamura, Fumio Hayashi
Tree leaves are important food sources for arboreal herbivores, such as primates, rodents, and marsupials. These animals do not eat leaves randomly in habitats with many tree species but rather choose based on the chemical components of leaves, such as sugars, fibers, proteins, and toxins. However, the effects of the microscale distribution of these chemicals within each leaf have not been examined for these animals. The giant flying squirrels Petaurista leucogenys are entirely arboreal, nocturnal herbivores, usually feeding on leaves and dropping leaf debris on the ground after partially consuming them...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28809378/reduction-rate-by-decompression-as-a-treatment-of-odontogenic-cysts
#4
L Oliveros-Lopez, A Fernandez-Olavarria, D Torres-Lagares, M-A Serrera-Figallo, R Castillo-Oyagüe, J-J Segura-Egea, J-L Gutierrez-Perez
BACKGROUND: Odontogenic cysts are defined as those cysts that arise from odontogenic epithelium and occur in the tooth-bearing regions of the jaws. Cystectomy, marsupialization or decompression of odontogenic cyst are treatment approach to this pathology. The aim of this study was to evaluate the effectiveness of the decompression as the primary treatment of the cystic lesions of the jaws and them reduction rates involving different factors. MATERIAL AND METHODS: 23 patients with odontogenic cysts of the jaws, previously diagnosed by anatomical histopathology (follicular cysts (7) and radicular cysts (16)) underwent decompression as an initial treatment...
August 15, 2017: Medicina Oral, Patología Oral y Cirugía Bucal
https://www.readbyqxmd.com/read/28809370/marsupialization-facilitates-movement-of-the-cystic-lesion-associated-deeply-impacted-mandibular-third-molar-in-spite-of-its-mature-roots
#5
R Sun, Y Cai, Y Wu, J-H Zhao
BACKGROUND: The odontogenic cystic lesions happened in the angle and ramus region are frequently associated with impacted mandibular third molars. The treatment plan was difficult to work out for the huge cystic lesions with deeply impacted third molars, since the enucleation with simultaneously removing the deeply impacted teeth may cause serious complications. Therefore, the marsupialization of the cystic lesions followed by enucleation with tooth removal has also been advocated. The aim of this study was to explore the movement of cystic lesion-associated deeply impacted mandibular third molars (IMTM) after marsupialization...
August 15, 2017: Medicina Oral, Patología Oral y Cirugía Bucal
https://www.readbyqxmd.com/read/28797038/plant-diversity-and-structure-describe-the-presence-of-a-new-threatened-australian-marsupial-within-its-highly-restricted-post-fire-habitat
#6
Eugene D Mason, Jennifer Firn, Harry B Hines, Andrew M Baker
Management of critical habitat for threatened species with small ranges requires location-specific, fine-scale survey data. The silver-headed antechinus (Antechinus argentus) is known from only two isolated, fire-prone locations. At least one of these populations, at Kroombit Tops National Park in central-eastern Queensland, Australia, possesses a very small range. Here, we present detailed vegetation species diversity and structure data from three sites comprising the known habitat of A. argentus at Kroombit Tops and relate it to capture data obtained over two years...
2017: PloS One
https://www.readbyqxmd.com/read/28792958/can-remote-infrared-cameras-be-used-to-differentiate-small-sympatric-mammal-species-a-case-study-of-the-black-tailed-dusky-antechinus-antechinus-arktos-and-co-occurring-small-mammals-in-southeast-queensland-australia
#7
Emma L Gray, Todd E Dennis, Andrew M Baker
The black-tailed dusky antechinus (Antechinus arktos) is an endangered, small carnivorous marsupial endemic to Australia, which occurs at low population density along with abundant sympatric populations of other small mammals: Antechinus stuartii, Rattus fuscipes and Melomys cervinipes. Using A. arktos as a model species, we aimed to evaluate the effectiveness of infrared digital camera traps for detecting and differentiating small mammals and to comment on the broad applicability of this methodology. We also sought to understand how the detection probabilities of our target species varied over time and characterize their activity patterns...
2017: PloS One
https://www.readbyqxmd.com/read/28792929/new-gliding-mammaliaforms-from-the-jurassic
#8
Qing-Jin Meng, David M Grossnickle, Di Liu, Yu-Guang Zhang, April I Neander, Qiang Ji, Zhe-Xi Luo
Stem mammaliaforms are Mesozoic forerunners to mammals, and they offer critical evidence for the anatomical evolution and ecological diversification during the earliest mammalian history. Two new eleutherodonts from the Late Jurassic period have skin membranes and skeletal features that are adapted for gliding. Characteristics of their digits provide evidence of roosting behaviour, as in dermopterans and bats, and their feet have a calcaneal calcar to support the uropagatium as in bats. The new volant taxa are phylogenetically nested with arboreal eleutherodonts...
August 9, 2017: Nature
https://www.readbyqxmd.com/read/28791270/herlyn-werner-wunderlich-syndrome-an-unusual-presentation-with-pyocolpos
#9
Eun Jung Jung, Moon Hyeong Cho, Da Hyun Kim, Jung Mi Byun, Young Nam Kim, Dae Hoon Jeong, Moon Su Sung, Ki Tae Kim, Kyung Bok Lee
Herlyn-Werner-Wunderlich syndrome is a rare congenital anomaly of the urogenital tract, which is characterized by the triad of uterus didelphys, obstructed hemivagina, and ipsilateral renal agenesis. It usually presents at puberty with pelvic pain, dysmenorrhea, and a vaginal or pelvic mass. Although rare, it may present with purulent vaginal discharge due to secondary infection of the obstructed hemivagina, making diagnosis difficult. A careful pelvic examination to identify the cervix and vagina is the key to the diagnosis of Müllerian duct anomalies and magnetic resonance imaging can provide additional useful information...
July 2017: Obstetrics & Gynecology Science
https://www.readbyqxmd.com/read/28762355/bismuth-subnitrate-iodoform-parafin-paste-used-in-the-management-of-inflammatory-follicular-cyst-report-of-two-cases
#10
Abdul Morawala, Dayanand Shirol, Yusuf Chunawala, Nupur Kanchan, Mayuri Kale
Dentigerous cyst or follicular cyst is a type of odontogenic cyst which encloses the crown of an unerupted tooth and is attached to the amelocemental junction and is the second most common odontogenic cyst contributing about 16.6% to 21.3% of all odontogenic cysts. Occurrence of Dentigerous cysts according to Shear is usually in 3rd and 4th decade in contrast to this finding Shibata et al showed that the age of discovery of the dentigerous cyst was generally 9-11 years. The treatment indicated for dentigerous cysts are surgical enucleation of the cyst, along with removal of the involved tooth; or the use of a marsupialization technique, which removes the cyst while preserving the developing tooth...
July 2017: Journal of the Indian Society of Pedodontics and Preventive Dentistry
https://www.readbyqxmd.com/read/28747528/embryo-implantation-evolved-from-an-ancestral-inflammatory-attachment-reaction
#11
Oliver W Griffith, Arun R Chavan, Stella Protopapas, Jamie Maziarz, Roberto Romero, Gunter P Wagner
The molecular changes that support implantation in eutherian mammals are necessary to establish pregnancy. In marsupials, pregnancy is relatively short, and although a placenta does form, it is present for only a few days before parturition. However, morphological changes in the uterus of marsupials at term mimic those that occur during implantation in humans and mice. We investigated the molecular similarity between term pregnancy in the marsupials and implantation in eutherian mammals using the gray short-tailed opossum (Monodelphis domestica) as a model...
July 26, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28743766/the-evolution-of-duplicate-gene-expression-in-mammalian-organs
#12
Katerina Guschanski, Maria Warnefors, Henrik Kaessmann
Gene duplications generate genomic raw material that allows the emergence of novel functions, likely facilitating adaptive evolutionary innovations. However, global assessments of the functional and evolutionary relevance of duplicate genes in mammals were until recently limited by the lack of appropriate comparative data. Here we report a large-scale study of the expression evolution of DNA-based functional gene duplicates in three major mammalian lineages (placental mammals, marsupials, egg-laying monotremes) and birds, on the basis of RNA sequencing (RNA-seq) data from nine species and eight organs...
July 25, 2017: Genome Research
https://www.readbyqxmd.com/read/28732668/spermatogenesis-in-a-neotropical-marsupial-species-philander-frenatus-olfers-1818
#13
A F A Figueiredo, D A Cordeiro, J C Nogueira, S A Talamoni, L R França, G M J Costa
Despite the singular morphology of the male genital system and the different reproductive strategies of marsupials, little emphasis has been given to the testis morphology and spermatogenic kinetics in this mammalian order. The present study aimed to investigate the testis function and the duration of spermatogenesis in the southeastern four-eyed opossum, Philander frenatus. Testes of six adult males were routinely processed for histological and stereological analyses. In order to determine the duration of spermatogenesis, intratesticular injections of tritiated thymidine were performed 1h, 13days and 21days before the sacrifice...
July 13, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28728938/didelphis-albiventris-naturally-infected-with-hepatozoon-canis-in-southeastern-brazil
#14
Maria Regina Lucas da Silva, Felipe Fornazari, Larissa de Castro Demoner, Carlos Roberto Teixeira, Helio Langoni, Lucia Helena O'Dwyer
Hepatozoon species are vector-borne pathogens that infect domestic and wild animals. Marsupials of the species Didelphis albiventris are adapted to urban and peri-urban areas and act as reservoir hosts for several parasites. The present study evaluated the occurrence of infection by Hepatozoon species in synantropic D. albiventris from Botucatu, São Paulo, Brazil. Blood samples and ectoparasites from 19 D. albiventris were collected from urban and peri-urban areas. Hepatozoon spp. detection was performed by microscopy and molecular analysis...
July 14, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/28721206/a-bipedal-mammalian-model-for-spinal-cord-injury-research-the-tammar-wallaby
#15
Norman R Saunders, Katarzyna M Dziegielewska, Sophie C Whish, Lyn A Hinds, Benjamin J Wheaton, Yifan Huang, Steve Henry, Mark D Habgood
Background: Most animal studies of spinal cord injury are conducted in quadrupeds, usually rodents. It is unclear to what extent functional results from such studies can be translated to bipedal species such as humans because bipedal and quadrupedal locomotion involve very different patterns of spinal control of muscle coordination. Bipedalism requires upright trunk stability and coordinated postural muscle control; it has been suggested that peripheral sensory input is less important in humans than quadrupeds for recovery of locomotion following spinal injury...
2017: F1000Research
https://www.readbyqxmd.com/read/28717292/conservative-management-of-unicystic-ameloblastoma-in-young-patients-a-prospective-single-center-trial-and-review-of-literature
#16
Mitsu Meshram, Lalit Sagarka, Jigar Dhuvad, Sonal Anchlia, Siddharth Vyas, Harsh Shah
AIMS: The study intends to evaluate the clinical outcome of treating young patients of unicystic ameloblastoma, by various conservative treatment modalities such as marsupialization, enucleation with bone curettage and aid in establishing sound treatment guidelines. MATERIALS AND METHODS: A case series of fifteen patients is presented of unicystic ameloblastoma, who presented to our Department over the past 6 years (2010-2015) and conservative method of treatment elected in all the patients...
September 2017: Journal of Maxillofacial and Oral Surgery
https://www.readbyqxmd.com/read/28704561/diet-overlap-and-spatial-segregation-between-two-neotropical-marsupials-revealed-by-multiple-analytical-approaches
#17
Vanessa Villanova Kuhnen, Gustavo Quevedo Romero, Arício Xavier Linhares, Jeferson Vizentin-Bugoni, Erica Aline Correa Porto, Eleonore Zulnara Freire Setz
Species co-existence depends on how organisms utilize their environment and resources. When two sympatric species are similar in some ecological requirements, their coexistence may arise from differences in resource use over time and/or space. Interactions among coexisting marsupials remain poorly understood, especially in the Neotropics. Here we combine spatial niche measurements, individual-resource networks, and isotopic niche approaches, to investigate the ecological strategies used by the Neotropical marsupials Didelphis aurita and Metachirus nudicaudatus to co-occur in an area of Serra do Mar State Park (southeast of Brazil)...
2017: PloS One
https://www.readbyqxmd.com/read/28695294/the-role-of-mhc-genes-in-contagious-cancer-the-story-of-tasmanian-devils
#18
REVIEW
Alison Caldwell, Hannah V Siddle
The Tasmanian devil, a marsupial species endemic to the island of Tasmania, harbours two contagious cancers, Devil Facial Tumour 1 (DFT1) and Devil Facial Tumour 2 (DFT2). These cancers pass between individuals in the population via the direct transfer of tumour cells, resulting in the growth of large tumours around the face and neck of affected animals. While these cancers are rare, a contagious cancer also exists in dogs and five contagious cancers circulate in bivalves. The ability of tumour cells to emerge and transmit in mammals is surprising as these cells are an allograft and should be rejected due to incompatibility between Major Histocompatibility Complex (MHC) genes...
July 11, 2017: Immunogenetics
https://www.readbyqxmd.com/read/28689530/congenital-vallecular-cyst-arare-and-potentially-lethal-condition
#19
Shabbir Ahmed Mallick, Tabinda Naz Qureshi, Ajoy Methew Varghese, Mona Mohammed Al Busaidi
Congenital vallecular cyst is a rare laryngeal lesion, accounting for 10-20% of all laryngeal cysts, with a potential to cause severe upper airway obstruction, which can be fatal. It can cause stridor, apnea, cyanosis, respiratory distress, and feeding difficulties. Diagnosis requires a high level of clinical suspicion and helps in timely intervention. Direct laryngoscopy is gold standard for definitive diagnosis. Treatment options include aspiration, marsupialization, and surgical excision. Here, we report a case of 7-week-old infant with complain of recurrent episodes of cyanosis when agitated, since the age of 3 weeks, admitted with impression of apparent life-threatening events (ALTEs)...
June 2017: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
https://www.readbyqxmd.com/read/28688214/uterine-molecular-changes-for-non-invasive-embryonic-attachment-in-the-marsupials-macropus-eugenii-macropodidae-and-trichosurus-vulpecula-phalangeridae
#20
Melanie K Laird, Jessica R Dargan, Lillian Paterson, Christopher R Murphy, Bronwyn M McAllan, Geoff Shaw, Marilyn B Renfree, Michael B Thompson
Pregnancy in mammals requires remodeling of the uterus to become receptive to the implanting embryo. Remarkably similar morphological changes to the uterine epithelium occur in both eutherian and marsupial mammals, irrespective of placental type. Nevertheless, molecular differences in uterine remodeling indicate that the marsupial uterus employs maternal defences, including molecular reinforcement of the uterine epithelium, to regulate embryonic invasion. Non-invasive (epitheliochorial) embryonic attachment in marsupials likely evolved secondarily from invasive attachment, so uterine defences in these species may prevent embryonic invasion...
July 8, 2017: Molecular Reproduction and Development
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