1,720,958 research outputs found
Double ileo-ileal and ileo-cecocolic intussusception due to submucous lipoma: case report
No full textIntestinal intussusception is a rare pathology in adults and counts for approximately 5-16% of all invaginations, according to literature. We report the case of a 54 years-old male affected by a double ileo-ileal and ileocecocolic invagination secondary to a submucosal inestinal lipoma. Because of a bowel obstruction symptomathology, the diagnosis was based on abdomen X-rays, abdominal ultrasound and multislice CT scan that showed a probable pre-operative diagnosis of intestinal intussusception. The diagnosis of double invagination was confirmed intraoperatively and was therefore performed a right colectomy extended to a long tract of ileum. Opening the specimen demonstrated the evidence of a submucosal lipoma on the head of the intussusceptum. After the description of this case, we proceed with review of the literature of adult intestinal invagination
CONFRONTO DEI VALORI PLASMATICI DELLE METALLOPROTEASI DELLA MATRICE 2,3,9 IN PAZIENTI CON CARCINOMI E FIBROADENOMI MAMMARI.
No full textIl processo di infiltrazione delle cellule tumorali nei tessuti limitrofi prevede il rimaneggiamento dello stroma peritumorale determinato da un’alta attività litica sulla matrice extracellulare da parte del fenotipo neoplastico invasivo. Tra i principali enzimi litici prodotti dalle cellule tumorali e principalmente coinvolti nel processo invasivo ci sono le metalloproteasi della matrice (MMPs). Lo scopo di questo lavoro è quello di confrontare i livelli plasmatici pre-operatori delle MMPs 2, 3, 9 in pazienti affette da carcinomi e fibroadenomi mammari per valutare un’eventuale differenza di espressione delle tre MMPs tra i due gruppi di pazienti. Sono stati quantizzati con ELISA test i valori delle MMPs 2, 3, 9 nel plasma prelevato 24 h prima dell’intervento chirurgico in 50 pazienti con carcinomi ed in 30 pazienti con fibroadenomi mammari. Il valore medio di MMP2 nelle pazienti con carcinoma è risultato essere significativamente superiore a quello nelle pazienti con fibroadenoma, mentre non è stata rivelata una differenza significativa per le altre due MMPs analizzate. Alla luce dei risultati ottenuti è possibile confermare il ruolo fondamentale svolto dalle MMPs nel fenomeno invasivo neoplastico. Inoltre, sulla base dei valori ottenuti per la MMP2, si potrebbe inserire la valutazione di questo enzima come marcatore a fianco ad altri parametri biologici e clinici nell’orientamento prognostico delle lesioni mammarie neoplastiche
Thyreopathy associated with vagus schwannoma
No full textWe report the case of a young woman who underwent total thyroidectomy for a suspect nodular thyreopathy and occasionally happened to be affected simultaneously by vagus nerve schwannoma. Symptomatology is discussed and we propose a review of the literature about this unfrequent pathology and discuss the latest diagnostic procedures and surgical indications and treatment
Moderni orientamenti nella chirurgia della parotide
Full text linkLa scelta del tipo di approccio nella chirurgia parotidea è di fondamentale importanza per condurre al meglio l’atto curativo pur preservando le delicate strutture del compartimento parotideo.
Lo scopo di questo lavoro è di dimostrare come un’approfondita conoscenza dell’anatomia ed una scrupolosa esecuzione dell’atto chirurgico permettano di conciliare radicalità chirurgica e salvaguardia delle strutture nobili.
Descriveremo quindi osservazioni anatomo-chirurgiche alla luce
delle patologie di nostra pertinenza, ricordando le diverse tipologie di
interventi eseguibili. Queste considerazioni saranno lo spunto per discutere ed analizzare alcune strategie chirurgich
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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