1,720,977 research outputs found
Ultrasound demonstration of distal biceps tendon bifurcation: normal and abnormal findings.
No full textWe demonstrate the US appearance of the distal biceps tendon bifurcation in normal cadavers and volunteers and in those affected by various disease processes. Three cadaveric specimens, 30 normal volunteers, and 75 patients were evaluated by means of US. Correlative MR imaging was obtained in normal volunteers and patients. In all cases US demonstrated the distal biceps tendon shaped by two separate tendons belonging to the short and long head of the biceps brachii muscle. Four patients had a complete rupture of the distal insertion of the biceps with retraction of the muscle belly. Four patients had partial tear of the distal biceps tendon with different US appearance. In two patients the partial tear involved the short head of the biceps brachii tendon, while in the other two patients, the long head was involved. Correlative MR imaging is also presented both in normal volunteers and patients. US changed the therapeutic management in the patients with partial tears involving the LH of the biceps. This is the first report in which ultrasound considers the distal biceps tendon bifurcation in detail. Isolated tears of one of these components can be identified by US. Knowledge of the distal biceps tendon bifurcation ultrasonographic anatomy and pathology has important diagnostic and therapeutic implications
Crohn disease obstruction of the biliopancreatic limb in a patient operated for biliopancreatic diversion for morbid obesity.
No full textDouble right inferior vena cava associated with an anomalous venous ring encircling the right common iliac artery: Report of one case with CT and US
No full textEmbryogenesis of the inferior vena cava (IVC) is a complicated process involving development, regression, anastomosis, and replacement of three pairs of venous channels: posterior cardinal, subcardinal, and supracardinal veins. Congenital anomalies of the IVC are explained by abnormal persistence or regression of parts of these embryonic veins. We describe a case a case of right double IVC associated with an anomalous venous ring encircling the right common iliac artery evaluated with CT and US. At the level of the aortic bifurcation, the dorsal vessel was seen posteriorly to the common iliac artery, and continued as the right common iliac vein. The ventral vein is divided in two branches: the left one continued as the left common iliac vein; the right one passed anteriorly to the right iliac artery, encircled it, and communicates into the right common iliac vein. The two vessels fused together below the level of the renal veins. The presence of a double right IVC is rare. It is usually asymptomatic, and requires no treatment. Preoperative awareness of the presence of this condition is important to prevent serious complications during abdominal and retroperitoneal surgery or during IVC filter placement. The main differential diagnoses for right double IVC include other venous anomalies such as periureteral venous ring, retroperitoneal lymphadenopathy, and the presence of other pathologic conditions (IVC thrombosis, dilated retroperitoneal vessels in portal hypertension and retroperitoneal hypervascular tumors). © 2007 Elsevier Ireland Ltd. All rights reserved
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
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