scholarly journals The Preliminary Analysis of Cave Lion Cubs Panthera spelaea (Goldfuss, 1810) from the Permafrost of Siberia

Quaternary ◽  
2021 ◽  
Vol 4 (3) ◽  
pp. 24
Author(s):  
Gennady G. Boeskorov ◽  
Valery V. Plotnikov ◽  
Albert V. Protopopov ◽  
Gennady F. Baryshnikov ◽  
Philippe Fosse ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Preliminary Analysis ◽  
Eastern Siberia ◽  
Close Proximity ◽  
Siberian Arctic ◽  
General Tone ◽  
Preliminary Description

A preliminary description is presented of the well-preserved frozen mummies of two cubs of the extinct cave lion Panthera spelaea (finds of 2017–2018, Semyuelyakh River, Yakutia, eastern Siberia, Russia). The fossil lion cubs were found in close proximity, but they do not belong to the same litter, since their radiocarbon ages differ: the female (named ‘Sparta’) was dated to 27,962 ± 109 uncal years BP, and the male (named ‘Boris’) was dated to 43,448 ± 389 uncal years BP. The lion cubs have similar individual ages, 1–2 months. The general tone of the colour of the fur coat of Sparta is greyish to light brown, whereas, in Boris, the fur is generally lighter, greyish yellowish. It is, therefore, possible that light colouration prevailed with age in cave lions and was adaptive for northern snow-covered landscapes. The article discusses the results of computed tomography of cubs of the cave lion, the possible reasons for their death, and the peculiarities of their existence in the Siberian Arctic.

scholarly journals ASSESSMENT OF MANDIBULAR 3RD MOLAR APICES TO THE INFERIOR DENTAL CANAL USING CONVENTIONAL RADIOGRAPHY AND CBCT

2021 ◽  
Vol 5 (4) ◽  
Author(s):  
Nehru Anand ◽  
M. Ashwin Chandra Veni ◽  
CL. Krithika Chndrasekar ◽  
A. Kannan Ashokan ◽  
Yasoda Aniyan
Keyword(s):  
Computed Tomography ◽  
Three Dimensional ◽  
Third Molar ◽  
Panoramic Radiograph ◽  
Conventional Radiography ◽  
High Dose ◽  
Close Proximity ◽  
Inferior Alveolar Canal ◽  
Conventional Ct ◽  
Inferior Dental Canal

Conventional radiographs provide only a 2 dimensional view of complicated three dimensional structures.  The proximity, angulations, location of impacted teeth, related to the IAN can be adequately determined using conventional 2-D periodical and panoramic radiographs. Computed tomography necessitates the administration of a high dose radiation, especially when the slice width is shortened to increased cost are the negative aspects of computed tomography compared with conventional imaging. Cone beam computed tomographies are becoming more readily available for use in maxilla facial applications. CBCT provides better image quality of teeth and their surrounding structures, compared with conventional CT and offers high spatial resolution. CBCT seems to be more accurate data about inferior alveolar canal. Hence the present study was undertaken to assess and select roots of third molar with close proximity to inferior dental canal in panoramic radiograph having radiographic signs of darkening of root, disruption of canal cortex and canal deviation and to evaluate the same roots with CBCT using trans axial and coronal sections which is angulated parallel to long axis to tooth, axial and coronal sections for proximity of inferior dental canal with the apices of third molar root. Keywords: CBCT, IAN

Abstract 17000: Quantifying Mitral Annular Calcification Using Echocardiography: Comparison to MAC Calcium Score From Gated Computed Tomography

Circulation ◽  
2020 ◽  
Vol 142 (Suppl_3) ◽  
Author(s):  
William Harvey ◽  
Sheldon Litwin
Keyword(s):  
Computed Tomography ◽  
Mitral Valve ◽  
Left Atrial ◽  
Left Atrial Volume ◽  
Calcium Score ◽  
Mitral Annulus ◽  
Atrial Volume ◽  
Mitral Annular Calcification ◽  
Close Proximity ◽  
Annular Calcification

Introduction: Mitral Annular Calcification (MAC) is present in 25-40% of people ≥ 60 years old and has associations with atrial fibrillation, stroke, endocarditis, mitral regurgitation, and mitral stenosis. MAC poses major challenges to surgical or transcatheter mitral valve interventions. Current echocardiographic methods for assessing MAC are limited. Goals: To assess transthoracic echocardiographic (TTE) approaches for quantifying MAC severity compared to a gold standard of MAC calcium score by gated computed tomography (CT). Methods: 75 patients undergoing evaluation for TAVR had TTE and CT in close proximity. MAC area and circumference were measured in parasternal long-axis (PLAX), parasternal short-axis (PSAX), and apical 2, 3, and 4-chamber views on TTE. Mitral valve gradients and left atrial volume were recorded. The curvilinear length of MAC in the PSAX view on TTE and cardiac CT were also measured. Associations between various TTE measures and MAC calcium score were assessed using linear regression. Results: Median age was 75.3, 50.4% female, 85.3% Caucasian. MAC area and circumference in PSAX on TTE showed moderate correlations (R 2 =0.32-0.37) with MAC calcium score. Curvilinear MAC length measures on SAX TTE and CT had improved correlation with MAC score (R 2 =0.41 & 0.78, Figure). Combined circumference of MAC from PLAX+PSAX had the strongest association (R 2 = 0.48). Interobserver variability on CT and TTE had coefficients of variation ranging 17-37%. Left atrial volume and mitral valve gradients had weak associations with MAC severity (R 2 =0.03-0.12). Tertiles of MAC calcium scores were 2650, 5150 and 7750. Conclusions: MAC length in the PSAX view showed the strongest association with MAC severity. Dedicated PSAX views of the mitral annulus may improve the ability to reproducibly grade MAC severity by echo.

scholarly journals Massive thymoma of the mid-posterior mediastinum: an unprecedented case in a young adult

2016 ◽  
Vol 49 (6) ◽  
pp. 403-405 ◽  
Author(s):  
Karen Fernandes de Oliveira ◽  
Marcio Maciel Rodrigues ◽  
Gesner Pereira Lopes ◽  
Renan Sandoval de Almeida ◽  
Juliana Lopes Lusvarghi ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Young Adult ◽  
Large Mass ◽  
Pulmonary Involvement ◽  
Posterior Mediastinum ◽  
Productive Cough ◽  
Video Assisted ◽  
Close Proximity ◽  
History Of ◽  
Mediastinal Widening

Abstract We report an unprecedented case of ectopic thymoma in a young adult. A 33-year-old male presented with a 10-day history of non-productive cough and fever. Investigation revealed mediastinal widening without pulmonary involvement. Computed tomography showed a large mass-14.8 × 10.8 × 8.4 cm-in the mid-posterior mediastinum, and a biopsy obtained by video-assisted thoracoscopy indicated that the mass was a tumor. Immunohistochemistry showed combined thymoma type AB1. Because of the considerable proportions of the tumor and its close proximity to major structures, the patient was treated with chemotherapy.

Clarifying the anatomy of common arterial trunk: a clinical study of 70 patients

2019 ◽  
Vol 21 (8) ◽  
pp. 914-922 ◽  
Author(s):  
Saurabh Kumar Gupta ◽  
Abhinav Aggarwal ◽  
Manish Shaw ◽  
Gurpreet Singh Gulati ◽  
Shyam S Kothari ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Clinical Study ◽  
Coronary Artery ◽  
Coronary Arteries ◽  
Detailed Knowledge ◽  
Anatomic Variations ◽  
Pulmonary Flow ◽  
Common Arterial Trunk ◽  
Arterial Trunk ◽  
Close Proximity

Abstract Aims Anatomic variations in hearts with common arterial trunk are well-known, although there is no large study of living patients. Detailed knowledge of the origins of the pulmonary and coronary arteries is vital for surgical management. We sought to clarify the variations using computed tomography. Methods and results We prospectively studied 70 consecutive patients using echocardiography and computed tomography. In 63 (90%) patients, there was aortic dominance, while 7 (10%) had dominance of the pulmonary component. In 27 (43%) patients with aortic dominance, part of the pulmonary segment arose from a truncal valvar sinus. A long confluent pulmonary channel was more common in patients with sinusal origin compared to those with non-sinusal origin of the pulmonary segment (19 vs. 0; P = 0.0005). Close proximity between the orifices of the coronary arteries and the pulmonary component was also more frequent with sinusal origin (21 vs. 6; P < 0.001) with 5 (19%) patients having pulmonary flow obstructed by a truncal valvar leaflet. Conclusion Sinusal origin of the pulmonary component is common with aortic dominance, frequently in association with a long confluent pulmonary segment, which may be in close proximity to the origin of a coronary artery. One-fifth of patients with sinusal origin of pulmonary component have a truncal valvar leaflet obstructing the pulmonary orifice. These morpho-anatomic findings have important implications for management.

scholarly journals Pre-operative assessment of impacted mandibular third molar and inferior alveolar canal using orthopantomograhpy and cone beam computed tomography

2016 ◽  
Vol 9 (4) ◽  
pp. 220
Author(s):  
Mahmuda Akter ◽  
Quazi Billur Rahman ◽  
Md. Wares Uddin ◽  
Gokul Chand Kundu ◽  
Samir Banik ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Third Molar ◽  
Molar Tooth ◽  
Cone Beam ◽  
The Third ◽  
Impacted Mandibular Third Molar ◽  
Mandibular Third Molar ◽  
Close Proximity ◽  
Inferior Alveolar Canal

<p class="Abstract">The aim of this study was to assess the proximity and relation of impacted mandibular third molar and inferior alveolar canal on orthopantomogram and cone beam computed tomography (CBCT). Sixty impacted mandibular third molars having close proximity with the  inferior alveolar canal were included. CBCT images were done to determine the exact location and relationship of impacted third molar tooth and inferior alveolar canal. We assessed the radiographic signs from orthopantomogram, the course of  inferior alveolar canal and proximity to the third molar tooth in CBCT. The buccal course of  inferior alveolar canal was most frequently detected (n=36) in CBCT findings. The impacted lower third molar roots were 55% contact with the  inferior alveolar canal and 45% separate from the canal. On orthopantomogram, the following signs were strongly correlated with actual contact: Superimposed relationship between the third molar and the inferior alveolar canal. CBCT is useful as a presurgical planning in patients with impacted mandibular third molar showing close proximity to the  inferior alveolar canal.</p>

FeXIV Line Emission Polarization of the July 11, 1991 Solar Corona

1994 ◽  
Vol 144 ◽  
pp. 541-547
Author(s):  
J. Sýkora ◽  
J. Rybák ◽  
P. Ambrož
Keyword(s):  
High Resolution ◽  
Solar Corona ◽  
Emission Line ◽  
Solar Eclipse ◽  
White Light ◽  
Preliminary Analysis ◽  
Line Emission ◽  
Total Solar Eclipse ◽  
Degree Of Polarization ◽  
High Resolution Images

AbstractHigh resolution images, obtained during July 11, 1991 total solar eclipse, allowed us to estimate the degree of solar corona polarization in the light of FeXIV 530.3 nm emission line and in the white light, as well. Very preliminary analysis reveals remarkable differences in the degree of polarization for both sets of data, particularly as for level of polarization and its distribution around the Sun’s limb.

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