1,720,967 research outputs found
Staging of hilar cholangiocarcinoma with ultrasound.
No full textThe preoperative assessment of the extent of biliary and vascular involvement by hilar cholangiocarcinoma is clinically important because resectability may be limited by tumor extension along the bile ducts into the hepatic parenchyma or to the adjacent hilar vessels. Thirty-five patients with hilar cholangiocarcinoma were studied with ultrasound, and the results were compared with operative findings and other diagnostic modalities. The level of intrahepatic biliary obstruction was determined in 100\% of patients with ductal ectasia, and a tumor mass was shown in 37.1\%. Imaging and Doppler ultrasound proved accurate in detecting the neoplastic involvement of the portal vein. Both correctly diagnosed portal occlusion and wall infiltration in 4 of 4 and 15 of 18 (83\%) patients, respectively, without any false-positives. On the contrary, imaging ultrasound had poor sensitivity in detecting infiltration of the hepatic artery (43\%) and metastases in regional lymph nodes (37\%), liver (66\%), and peritoneum (33\%). In conclusion, ultrasound may be valuable in the preoperative staging of hilar cholangiocarcinoma, specially in predicting ductal and portal involvement
Normal prostate gland: examination with color Doppler US.
No full textTo evaluate the vascular anatomy of the prostate gland with transrectal color Doppler ultrasound (US).Thirty-five normal prostate glands were studied. Imaging findings were interpreted on the basis of findings from previous anatomic studies.Distribution of flow signals within the gland was differentiated into two parenchymal groups of arteries, urethral and capsular. The urethral group entered the prostate at the bladder neck and sent forth branches to supply the periurethral zone and the inner portion of the gland. The capsular group coursed along the anterolateral surface of the prostate and sent forth perforating branches to the outer portion of the gland. Intraprostatic venous signals were seen mainly within the periurethral zone.Transrectal color Doppler US can depict the vascular anatomy of the prostate gland. Knowledge of the normal vascular appearance of the gland should aid in the differentiation of normal from abnormal findings
[Evaluation of rheumatoid arthritis of the knee with Doppler color].
No full textColor-Doppler US was used to study the vascularization of the synovial membrane and of the periarticular tissues of the knee in 14 normal subjects and 15 patients with active rheumatoid arthritis. The normal subjects exhibited few spot signals within the connectival spaces surrounding the knee and adjacent to the femoral condyles and to the tibial plates. The signals were mostly arterial and impedance was high because of the absence of inversion of diastole. A hypervascular pattern was detected in 13/15 patients with rheumatoid arthritis as a result of hyperemia associated with inflammation and synovial neoangiogenesis. In these patients, the signals came mostly from the synovial pannus and the soft tissues surrounding the joint. Spectral analysis detected both venous and arterial waveforms with lower resistance than normal (resistive index ranging 0.65 to 0.76). After local treatment, both venous and low-impedance arterial signals were no longer detectable in 4/9 patients with clinical remission. In conclusion, color-Doppler US can support gray-scale US in the assessment of joint inflammation in rheumatoid arthritis patients. Vascular findings seem to correlate well with local symptoms. Color-Doppler US could make a useful tool for monitoring the clinical activity of the disease in selected joints
Calcific tendinitis of the rotator cuff as a cause of drooping shoulder
No full textWe describe a case of inferior glenohumeral subluxation or drooping shoulder secondary to acute calcific tendinitis of the rotator cuff. The various etiologies of drooping shoulder and the specific causes determining glenohumeral widening in our report are discussed. The importance in recognizing this uncommon complication of a common abnormal finding and correction by aspiration is stressed
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
Brachial plexus assessment with three-dimensional isotropic resolution fast spin echo MRI: comparison with conventional MRI at 3.0 T.
No full textSonographic characterization of an accessory fissure of the left hepatic lobe determined by omental infolding.
No full textThis article describes the sonographic appearance of a very common accessory fissure of the liver located on the inferior side of the left lobe. The fissure was recognized in about 5\% of 800 consecutive subjects and showed variable appearance owing to different insertion levels on the inferior hepatic surface. It extended from the left hepatic border to the Rex's recess or alternatively to the falciform ligament or the gallbladder fossa and contained the hepatogastric and hepatoduodenal ligaments, as demonstrated by laparotomy in six cases. At surgery, there was no evidence of thickening of Glisson's capsule at the fissure site, thus suggesting that the fissure is the result of extrinsic remodeling of the left lobe by omental infolding
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