Petrous Jugular Malposition (Diverticulum)

1993 ◽  
Vol 109 (5) ◽  
pp. 847-852 ◽  
Author(s):  
Dennis G. Pappas ◽  
Ronald A. Hoffman ◽  
Noel L. Cohen ◽  
Roy A. Holliday ◽  
Dennis. G. Pappas
Keyword(s):  
High Resolution ◽  
Literature Review ◽  
Clinical Symptoms ◽  
Jugular Bulb ◽  
Tympanic Cavity ◽  
Pathologic Process ◽  
High Resolution Ct ◽  
Anatomic Variant ◽  
The Relationship

Jugular bulb anatomy is variable. A “high-riding” bulb extending into the tympanic cavity is a well-described anomaly. Petrous jugular malposition (diverticulum) (PJMD), however, is rare. The relationship between PJMD and clinical symptoms is questionable because the differentiation between PJMD as an anatomic variant and pathologic process is unproved. A literature review reveals 14 previously documented cases. We report an additional four cases. Diagnostic and management dilemmas are discussed, with the importance of high-resolution CT Stressed.

scholarly journals High-resolution CT Analyses of the Relationship between Small Lung Adenocarcinoma and Surrounding Vessels.

Haigan ◽  
2000 ◽  
Vol 40 (7) ◽  
pp. 743-749
Author(s):  
Kunihiko Shimizu ◽  
Kouzou Yamada ◽  
Humihiro Oshita ◽  
Ikuo Nomura ◽  
Kazumasa Noda ◽  
...  
Keyword(s):  
High Resolution ◽  
Lung Adenocarcinoma ◽  
High Resolution Ct ◽  
The Relationship

scholarly journals Relationship between High Resolution CT Chest and Laboratory Parameters- An Assessment Tool for the Safe and Timely Management of Suspected/Confirmed Covid-19 Disease Patients

2021 ◽  
Vol 2 (3) ◽  
pp. 4
Author(s):  
Sanum Kashif ◽  
Erum Pervaiz
Keyword(s):  
High Resolution ◽  
Assessment Tool ◽  
Rank Correlation ◽  
P Value ◽  
Lung Involvement ◽  
Laboratory Parameters ◽  
High Resolution Ct ◽  
Isolation Ward ◽  
Study Laboratory ◽  
The Relationship

Objective: To assess the relationship between radiological findings and laboratory parameters, for safe andtimely management of COVID-19 disease patients.Study Design: Retrospective observational study.Place and Duration of Study: The study was conducted at COVID-19 isolation ward of Frontier Corps Hospital, Quetta, from April 15th to June 30th, 2020.Materials and Methods: Suspected COVID-19 (on the basis of history) patients, from April 15th to June 30th ,2020, were included in the study. Laboratory parameters including, Neutrophils, Lymphocytes, C-ReactiveProtein (CRP) were retrospectively collected from medical records. Severity of lung changes on high resolutionchest CT was scored according to the lung involvement (CO-RADS score 1-6). Spearman rank correlation wasused to evaluate the relationship between CO-RADS score and laboratory parameters.Results: A total of 50 patients (mean age 34.7+6.46 years [standard deviation]; age range, 23-49 years) wereevaluated. The patients underwent a total of 150 CT scans chest. CO-RADS was significantly co-related withneutrophils count at day 1 (r=0.93, p-value < 0.001), day 5 (r=0.47, p-value=0.001), day 14 (r=0.94, p value<0.001), lymphocytes count at day 1 (r=0.15, p-value<0.001), day 5 (r=0.90, p-value<0.001), day 14(r=0.83, p-value=0.004), CRP at day 1 (r=0.90, p-value=0.001), day 5 (r=0.36, p-value=0.011) and at day 14(r=0.93, p-value=0.001).Conclusion: The results of this study showed that the severity of lung involvement on high resolution CT (HRCT) chest positively correlate with laboratory parameters. The study provides an insight into the appropriateinterval of chest CT to reduce radiation and promote timely management of COVID-19 patients.

scholarly journals Skeletal Anatomy of the Basicranium and Auditory Region in the Metacheiromyid Palaeanodont Metacheiromys (Mammalia, Pholidotamorpha) Based on High-Resolution CT Scans

2019 ◽  
Vol 75 (3-4) ◽  
pp. 484-503
Author(s):  
Timothy J. Gaudin ◽  
John R. Wible ◽  
Kenneth D. Rose ◽  
Robert J. Emry ◽  
Michelle Spaulding
Keyword(s):  
High Resolution ◽  
Ct Scans ◽  
Tympanic Cavity ◽  
High Resolution Ct ◽  
Tegmen Tympani ◽  
Ear Ossicles ◽  
Auditory Region ◽  
First Time ◽  
Auditory Features ◽  
Large Spherical

Abstract Cranial skeletal material of the Eocene palaeanodont Metacheiromys marshi was examined using high-resolution CT scans. The present study represents the first time that CT scans have been conducted on skulls of this extinct fossorial mammal. The bony osteology of the auditory region is described in detail, including the ectotympanic and entotympanic, the petrosal in both tympanic and endocranial views, and the middle ear ossicles. The results of this investigation confirm a number of derived resemblances between palaeanodonts and xenarthrans, including a large entotympanic element in the medial wall of the auditory bulla, the presence of an anteroventral process of the tegmen tympani, and a posttemporal canal. However, the present study also provides novel derived auditory features linking palaeanodonts and pangolins, consistent with current understanding of palaeanodont phylogenetic relationships, including the absence of an ectotympanic styliform process, a posterolaterally oriented aperture to the cochlear fossula, and a convex mallear head / concave incudal head. Several autapomorphic features characterizing the auditory osteology of Metacheiromys are also noted. The presence of a large, spherical mallear head, and of a capacious tympanic cavity extended into sinuses in surrounding bones, likely represent adaptations for fossoriality, consistent with palaeobiological inferences drawn from the postcranial anatomy of Metacheiromys.

Jugular Bulb Diverticula: Clinical and Radiologic Aspects

2003 ◽  
Vol 128 (3) ◽  
pp. 382-386 ◽  
Author(s):  
Cem Bilgen ◽  
Tayfun Kirazli ◽  
Fatih Ogut ◽  
Secil Totan
Keyword(s):  
High Resolution ◽  
Clinical Presentation ◽  
Clinical Symptoms ◽  
Jugular Bulb ◽  
Clinical Findings ◽  
The Other ◽  
Reference Line ◽  
Ct Scans ◽  
Number Of Patients ◽  
Axial Ct

OBJECTIVE: This study was performed to determine the clinical presentation of jugular diverticulum and its relevance with the extension of the lesion. STUDY DESIGN: The records and high-resolution CT scans of 1474 patients, with otologic symptoms or related clinical findings, were evaluated retrospectively. In 17 cases in which CT scans revealed the presence of jugular diverticulum, sensorineural symptoms were evaluated with respect to a reference line, perpendicular to the basal turn of the cochlea and tangent to the vestibule in axial CT scan images. RESULTS: When the extension of jugular diverticulum was posterior to the reference line, sensorineural symptoms with vertigo were dominant in most patients (72.7%) in this group. On the other hand, for the patients with anterior-extending jugular diverticulum, sensorineural symptoms without vertigo were detected in 50% of patients, whereas 33.3% had sensorineural symptoms with vertigo. CONCLUSION: This study revealed a relationship between the extension of jugular diverticulum and clinical symptoms. However, this relationship lacks statistical evidence because of the limited number of patients.

scholarly journals The Relationship Between Long-term, Low-dose Macrolide Therapy and Acute Exacerbation in Idiopathic Bronchiectasis Classified by High-resolution Computed Tomography

2020 ◽  
Author(s):  
ZENYA SAITO ◽  
Masahiro Yoshida ◽  
Saiko Nishioka ◽  
Kentaro Tamura ◽  
Nobumasa Tamura ◽  
...  
Keyword(s):  
Computed Tomography ◽  
High Resolution ◽  
Acute Exacerbation ◽  
Low Dose ◽  
Clinical Symptoms ◽  
High Resolution Computed Tomography ◽  
Significant Difference ◽  
Severe Group ◽  
The Relationship

Abstract Background: High-resolution computed tomography (HRCT) and long-term, low-dose macrolide therapy has been established as a diagnostic method and treatment for bronchiectasis. HRCT correlates with clinical symptoms, respiratory function and quality of life in bronchiectasis. However, whether it will lead to reduction of macrolide therapy effects is unknown. We investigated the relationship between the efficacy of macrolide therapy and severity assessment performed by HRCT in idiopathic bronchiectasis.Methods: Ninety-nine patients with idiopathic bronchiectasis were selected. Acute exacerbation (AE) incidence was set as a comparison factor for the treatment effect. First, patients were divided into the severe and non-severe group based on HRCT. The severe group was defined to have abnormal findings in three or more lobes and in both lungs and the non-severe group as having two or fewer lobes or one side of the lung. Next, each group was divided into subgroups with and without macrolide therapy. Finally, the relationship between macrolide therapy and the AE incidence in each subgroup was compared.Results: Among the 99 idiopathic patients, 50 and 49 were included in the non-severe and severe groups, respectively. In the non-severe group, the subgroup with macrolide therapy had significantly less AE than the subgroup without macrolide (odds ratio [OR] = 0.10, P < 0.036). No significant difference was found in the severe group (OR = 0.70, P = 0.57).Conclusions: HRCT may be useful in predicting the effect of long-term, low-dose macrolide therapy for idiopathic bronchiectasis.

Endolymphatic Duct Obstruction Related to a Jugular Bulb Diverticulum: High Resolution CT and MR Imaging Findings

2002 ◽  
Vol 57 (5) ◽  
pp. 424-428 ◽  
Author(s):  
Sébastien Schmerber ◽  
Virginie Lefournier ◽  
Jean-Pierre Lavieille ◽  
Kamel Boubagra
Keyword(s):  
High Resolution ◽  
Mr Imaging ◽  
Jugular Bulb ◽  
Imaging Findings ◽  
Duct Obstruction ◽  
High Resolution Ct ◽  
Endolymphatic Duct

Radiation Damage, Contrast and Statistics in High Resolution Biological Electron Microscopy

1970 ◽  
Vol 28 ◽  
pp. 260-261
Author(s):  
Robert M. Glaeser
Keyword(s):  
High Resolution ◽  
Particle Flux ◽  
Unit Area ◽  
Signal To Noise ◽  
Resolution Image ◽  
High Resolution Image ◽  
Pass Through ◽  
Counting Statistics ◽  
The Relationship ◽  
Picture Element

It is well known that a large flux of electrons must pass through a specimen in order to obtain a high resolution image while a smaller particle flux is satisfactory for a low resolution image. The minimum particle flux that is required depends upon the contrast in the image and the signal-to-noise (S/N) ratio at which the data are considered acceptable. For a given S/N associated with statistical fluxtuations, the relationship between contrast and “counting statistics” is s131_eqn1, where C = contrast; r2 is the area of a picture element corresponding to the resolution, r; N is the number of electrons incident per unit area of the specimen; f is the fraction of electrons that contribute to formation of the image, relative to the total number of electrons incident upon the object.

Skeletal elements of crinoid echinoderms: High-resolution structural and microanalytical results

1983 ◽  
Vol 41 ◽  
pp. 194-195
Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor
Keyword(s):  
High Resolution ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Structural Features ◽  
Sea Stars ◽  
High Resolution Tem ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Echinodermata is a phylum of marine invertebrates which has been extant since Cambrian time (c.a. 500 m.y. before the present). Modern examples of echinoderms include sea urchins, sea stars, and sea lilies (crinoids). The endoskeletons of echinoderms are composed of plates or ossicles (Fig. 1) which are with few exceptions, porous, single crystals of high-magnesian calcite. Despite their single crystal nature, fracture surfaces do not exhibit the near-perfect {10.4} cleavage characteristic of inorganic calcite. This paradoxical mix of biogenic and inorganic features has prompted much recent work on echinoderm skeletal crystallography. Furthermore, fossil echinoderm hard parts comprise a volumetrically significant portion of some marine limestones sequences. The ultrastructural and microchemical characterization of modern skeletal material should lend insight into: 1). The nature of the biogenic processes involved, for example, the relationship of Mg heterogeneity to morphological and structural features in modern echinoderm material, and 2). The nature of the diagenetic changes undergone by their ancient, fossilized counterparts. In this study, high resolution TEM (HRTEM), high voltage TEM (HVTEM), and STEM microanalysis are used to characterize tha ultrastructural and microchemical composition of skeletal elements of the modern crinoid Neocrinus blakei.

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