1,720,957 research outputs found
Unusual Presentation of Oropharyngeal B-Cell Lymphoma
No full textWe present the intriguing case of a 64-year-old woman in good health complaining of dysphonia and odynophagia for about 2 months. Flexible fiberoptic laryngoscopy revealed an excavated lesion on the right side of the base of the tongue, which was in communication with the laryngeal vestibule through the epiglottis. The patient underwent biopsy of the lesion by microlaryngoscopy under general anesthesia. Histological evaluation of the surgical specimen revealed a high-grade diffuse large B-cell lymphoma of non-germinal center type. Excavated lesion at the base of the tongue may be of various types, and it is important to consider rarer differential diagnoses, especially in patients with clinical histories not suggestive of squamous cell carcinomas or lesions of infectious origin. Non-Hodgkin's lymphomas arising from the base of the tongue are very rare. Moreover, this lesion is usually described in the literature as a swelling with an intact and smooth surface, totally different from that of our patient. The aim of this report is to examine clinically, endoscopically, and radiologically the main differential diagnoses of an excavated lesion of the base of the tongue, focusing on one of the rarest ones, large B-cell lymphoma of the oropharynx
The paranasal sinus localization of cholesteatoma: a systematic review
No full textParanasal sinus cholesteatoma is a rare occurrence for which only a few cases have been reported in the literature, particularly in the frontal and maxillary sinuses. The clinical features are non-specific, and thus a broad differential diagnosis should be considered. In most cases, diagnostic imaging is carried out through CT and/or MRI scans, and the treatment goal is complete eradication regardless of the approach. In our review, we followed the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) guidelines and Egger et al.’s approach for Systematic Reviews in Health Care. The papers included were in English or Italian, with an available and congruous full text. Out of the 140 selected articles, we included only 22 papers, ranging from 1958 to 2020 and accounting for 24 patients. Eleven had cholesteatoma in the frontal, 9 in the maxillary sinus, and 4 in other sites. Most patients underwent CT scans or combined CT and MRI, and an open approach was the most selected procedure. Only 2 patients showed postoperative complications, and 5 patients had a recurrence over an average follow-up period of 25 months. In this first systematic review on this subject, we provide an overview of the diagnostic procedures, the proper surgical approach and the postoperative follow-up found in the literature without precise and shared guidelines
Mandibular reconstruction in head and neck cancer: which is the gold standard?
No full textIntroduction: The aim of this study is to perform a systematic review to compare the outcomes of the different surgical options for mandibular reconstruction in head and neck cancer. Material and methods: 93 articles were selected. Four groups were identified: titanium plate without flaps, titanium plate covered by soft tissue flap, bone tissue flaps and double flaps. We compared patients’ characteristics, site of mandibulectomy, type of reconstruction and complications. Results: 4697 patients were reported. The groups were not homogeneous regarding the type of defect and the treatment history. A significant difference in terms of post-operative complications was found between group 1 and group 2 (p < 0.00001), and between group 2 and group 3 (p < 0.00001). Total complications rate for group 4 was significantly higher when compared to group 3 (p < 0.00001), but no significant difference was found with group 2. Conclusion: These results suggest that mandibular reconstruction using a microvascular bone flap is the best surgical option in patients without significant comorbidities
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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