1,721,007 research outputs found
Adenomatoid odontogenic tumor: a case report with immunohistological profile.
No full textThe adenomatoid odontogenic tumor (AOT) is an uncommon tumor of odontogenic origin, composed of odontogenic epithelium and characterized by slow but progressive growth. We report a rare case of AOT in an 18-year-old, who presented with a palpable bony-hard swelling in the anterior maxillary region. The tumor was radiographically well-defined, and exhibited unilocular radiolucency. Histologically, the appearance was of solid nodules of cuboid or columnar cells of odontogenic epithelium, forming typical nests or duct-like structures. Immunohistochemistry was positive for cytokeratins (CK) CK5/6, CK17, CK19 and negative for KI-67. The results were consistent with a diagnosis of AOT.
CONCLUSION: A case of AOT is presented, emphasizing on the importance of recognizing neoplasms arising in odontogenic tissues. Recurrences seldom occur, and surgical cure is recommended
Nevus of Hoffmann-Zurhelle: a case around the right parotid duct.
No full textNevus lipomatosus cutaneous superficialis (NLCS) is an extremely rare hamartomatous disorder comprising of ectopic mature adipose tissue. The lesions take the form of large, slow-growing, sessile or pedunculated tumors. We report the case of an 11-year-old boy with NLCS, dating back many months, that was growing as a cuff around the parotid duct. The lesion was successfully removed by diode laser excision (980 nm) and a diagnosis of NLCS was rendered. At one-year follow-up the tumor has not recurred. To our knowledge this is the first report of NLCS in the oral cavity; the characteristic clinical and morphological features aided in the diagnosis of this hamartoma. The peculiarity of this case is its location; the extreme rarity of NLCS, in general, probably makes this case unique
Granular cells tumour in the oral cavity: report of eleven cases treated with laser surgery.
No full textAIM: The aim of this paper is to examine the clinical and histological feature of oral tumours of neural derivation and discuss their treatment. METHODS: Between 1999 and 2004, 11 patients (6 females, 5 males; age range 28-66 years) were treated for tumours classified as being of neural origin; they were all myoblastomas or granular cells tumours (ex Abrikossoff tumour). Eight were located on the dorsum of the tongue, 2 on the lateral margin and 1 on the right buccal mucosa. In all cases the mass appeared nodular, single and firm; patients were treated in a single session by excisional resection with 808 and 830 diode laser. RESULTS: During follow-up, which ranged from 5 months to 5 years, there was no indication of tumour recurrence. Histopathological analysis of haematoxylin and eosinstained sections showed all specimens to exhibit features typical of GCT; 6 tumours were well circumscribed, whereas 5 infiltrated adjacent connective tissue, muscle fibres and nerve bundles. In 10 of the 11 cases, the immunohistochemical S-100 protein stain was available and appeared positive. Pseudo-epitheliomatous hyperplasia of different degrees was present in 5 patients, along the overlying epithelium. CONCLUSIONS: Granular cell tumour is a benign neoplasm with a tendency to relapse if not completely removed. The usefulness of laser in the surgical treatment of these tumours particularly if small in size, is underlined
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
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