1,720,971 research outputs found
Ectopic lingual thyroid as unusual cause of severe dysphagia
No full textEctopic lingual thyroid is an uncommon embryological aberration characterized by the presence of thyroid tissue located in a site different from the pretracheal region as in the normal. Lingual thyroid is the most frequent ectopic location of the thyroid gland, although its clinical incidence varies between 1:3000 and 1:10,000. We present the case of a 26-year-old woman who presented severe dysphagia caused by a mass located on the base of the tongue in the midline. An endoscopic partial removal of the ectopic tissue allowed her to rapidly regain her swallowing capacity. The literature regarding the incidence and diagnosis of lingual thyroid is reviewed and the possibilities of treatment discussed
Extended parotidectomy.
No full textMalignant tumours of the parotid gland represent a group of relatively rare lesions. The medical records of 363 patients with parotid swelling treated between 1974 and 2003 at the "G. Ferreri" Department of Otorhinolaryngology, "La Sapienza" University in Rome were retrospectively analysed. Clinical presentation, pre-operative investigations, surgical procedure, histopathology report, post-operative complications, and the oncological results of 19 patients who underwent extended radical parotidectomy for malignant neoplasm of the parotid gland are discussed. Extended radical parotidectomy, reserved for neoplasms in an advanced stage, involves the removal of the entire parotid gland, with sacrifice of the facial nerve and the resection en bloc of the adjacent structures affected by neoplastic infiltration, such as the temporal bone, the mandibular bone, the skin, blood vessels and nerves. In addition to this surgical treatment, a cycle of adjuvant radiotherapy is also necessary. The overall rate of survival at 10 years depends mainly on the histological characteristics of the tumour, and, in this series, is reported to be approximately 58%. These data indicate that total extended radical parotidectomy combined with post-operative radiotherapy, represents the best therapeutic approach with regard both to quality of life and life expectancy, in patients with an advanced stage of malignant neoplasm of the parotid gland
Infrahyoid fascio-myocutaneous flap as an alternative to free radial forearm flap in head and neck reconstruction.
No full textThe use of microvascular free flaps is currently the favored method for the reconstruction of defects after resection of head and neck cancer. The flap most commonly used for head and neck reconstruction is the free radial forearm flap, but the less popular infrahyoid flap represents a good alternative in selected cases. This flap has proven to be helpful in the reconstruction of a wide range of moderate-sized head and neck defects.We reviewed a series of 13 patients with defects resulting from cancer of the head and neck, who underwent infrahyoid flap reconstruction as an alternative to free radial forearm flap. The series includes 12 squamous cell carcinomas arising from the oral cavity and oropharynx, and 1 Merkel cell carcinoma of the submental skin. In the harvesting of the flap, the technical modifications recently suggested by Dolivet et al were used in all cases. Furthermore, another technical change has been introduced so creating a new infrahyoid facio-myocutaneous flap (IHFMCF). The surgical technique is described in detail.No total or partial flap necrosis was experienced. All reconstructions healed quickly without wound complications and with good functional results. The healing process in the donor site was excellent in every case with good aesthetic results.The IHFMCF is a versatile, reliable, and convenient flap suitable for repairing small and medium-sized defects of the oral cavity and oropharynx and obviates the need for a microvascular reconstruction
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
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