1,720,976 research outputs found
Diagnostic Pitfalls Related to Morular Metaplasia in Endometrioid Carcinoma: An Underestimated Issue
No full textHere, we present a case that highlights the crucial pitfalls related to the presence of morular metaplasia (MM) in endometrioid carcinoma, which are insufficiently recognized in the routine pathology practice. A 45-year-old woman underwent hysterectomy with rectosigmoidectomy due to a 11-cm mass involving uterus, right ovary, and rectosigmoid colon. Histologically, the lesion appeared as a predominantly solid carcinoma with a minor glandular component. Results of the first immunohistochemical analysis suggested a colorectal origin (PAX8-, CK7-, WT1-, hormone receptors-, and CDX2+ in the absence of mucinous features). Subsequent immunohistochemistry (nuclear β-catenin+, CD10+, and low ki67 in the solid areas) supported a diagnosis of endometrioid carcinoma with diffuse MM. This case remarks that morphological and immunohistochemical features of MM may conceal the glandular architecture and the typical immunophenotype of endometrioid carcinomas. Acknowledging the diagnostic issues related to MM appears crucial to avoid misdiagnosis and inappropriate patient management
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
Significance of stromal markers in atypical polypoid adenomyoma
No full textAtypical polypoid adenomyoma (APA) may progress to endometrioid carcinoma and may mimic myoinvasive carcinoma on biopsy specimens. Here, we present a case of an APA of the uterine cervix hysteroscopically treated, which recurred two years after and progressed to endometrioid carcinoma. In all biopsy specimens and in the hysterectomy specimen, the benign APA component showed an unusual immunohistochemical stromal pattern (periglandular fringe-like CD10 pattern, diffuse h-caldesmon positivity, p16 negativity), which is typical of myoinvasive carcinoma. Interestingly, the other three cases of cancerized APA assessed for h-caldesmon in the literature showed diffuse stromal positivity also in the benign APA component. Our case shows that the stromal markers used for differentiating between APA and myoinvasive carcinoma may be misleading even when their pattern seems unequivocal. Furthermore, our case suggests that h-caldesmon positivity might be a prognostic marker for progression of APA to carcinoma. Further studies are encouraged in this regard
Hysteroscopic vaginoscopy. An additional diagnostic tool for recto-vaginal deep infiltrating endometriosis
No full textEndometriosis is the presence of endometrial tissue outside the uterine cavity. Rectovaginal infiltration is present in 5% to 25% of the patients diagnosed with endometriosis. Accurate diagnosis is imperative for adequate counseling. Hysteroscopic vaginoscopy allows the inspection of the posterior vaginal fornix, not only providing better visualization of the area due to image magnification, but also allowing to obtain biopsy providing pathologic confirmation. We report the case of a 49-year-old nulliparous patient with long history of severe dysmenorrhea, deep dyspareunia and debilitating chronic pelvic pain not responding to medical treatment. On physical exam, recto-vaginal tender nodularity was palpated. Vaginal ultrasound and magnetic resonance imaging confirmed the presence of the nodular formation extending up to the rectum. In-office vaginoscopy revealed a perforated bulge on the uterine cervix, mimicking a double cervix. A biopsy of the nodule confirmed the presence of endometrial tissue, confirming the diagnosis of endometriosis. Patient underwent total hysterectomy with excision of deep infiltrating endometriosis which required segmental bowel resection with diverting loop colostomy. The final pathology confirmed the diagnosis of deep infiltrating endometriosis
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