1,720,962 research outputs found
The role of local resection of ampullary neoplasms (ampullectomy) 100-year after Halsted description
No full text[Stromal tumors of the stomach. Our experience with 25 patients].
No full textStromal tumors (GIST) represent 5\% of gastric neoplasms. Twenty-five patients with GIST underwent surgical operation: the tumor was benign, malignant, and borderline in 11, 12, and 2 cases, respectively. Main symptoms were abdominal pain (36\%), and digestive haemorrhage (32\%); 4 patients (16\%) complained of abdominal mass. In 5 patients the diagnosis was incidental. Surgical operations (12 local resections, 9 partial gastric resections, and 4 total gastrectomies) were macroscopically curative in all the patients. In 3 patients the resection was extended to liver (1 case), spleen, pancreatic body-tail, and left kidney (1 case), and diaphragm (1 case) because of contiguous involvement of these organs. Postoperative mortality and morbidity were 4\% and 20\%, respectively. A patient with benign GIST passed away 36 months after operation because of breast cancer disease; other 9 patients are alive from 3 months to 25 years after operation. Three patients with low grade malignant GIST are well at mean follow up of 53 months. The 9 patients with high grade neoplasms are all dead (median survival time: 18 months). The 2 patients with borderline tumors are alive without evidence of disease at 3 and 8 years
Cystic tumors of the pancreas from Compagno and Oertel to nowadays. A learning on the way
No full textThe Dagradi-Serio-Iacono operation central pancreatectomy
No full textCentral pancreatectomy (CP) is a segmental pancreatic resection indicated to remove benign or low-grade malignant
tumors of the isthmus and proximal part of the body of the pancreas. The main advantage of this operation compared with major
resections is that it permits to spare normal pancreatic parenchyma;moreover, spleen and upper digestive and biliary tracts are saved.
The description of the complete operation was reported for the first time by Dagradi and Serio in 1984 and subsequently spread
worldwide by Iacono and Serio. In our opinion, it should be called the Dagradi–Serio–Iacono operation, by the names of the
surgeons who first performed it (Dagradi and Serio), and by the names of the surgeons responsible for reporting it worldwide
with precise indications (Iacono and Serio). Operation requires a midline or a bilateral subcostal incision; the lesser sac is entered
through dissection of the transverse colon from the omentum or by transecting the gastrocolic ligament. The pancreatic segment
harboring the lesion is then mobilized and its posterior surface carefully dissected from the splenic vein and artery. Subsequently,
the pancreatic portion harboring the tumor is isolated at its superior margin from the splenic artery after the pancreas is transacted.
The extent of the resection of the central segment is limited on the right by the gastroduodenal artery and on the left by the need
to leave at least 5 cm of normal pancreatic remnant. The resected pancreatic specimen is sent to the pathologist for confirmation
of diagnosis and to check if the resection margins are adequate. Hemostasis of the two raw surfaces is achieved with interrupted 5
or 4/0 nonabsorbable stitches. When it is not stapled, theWirsung’s duct of the cephalic stump is sutured selectively with a figureof-
eight nonabsorbable stitch. An end-to-end invaginated pancreaticojejunostomy is carried out with a single layer of interrupted
stitches. The operation is concluded with the construction of an end-to-side jejuno-jejunostomy about 50 cm distal to the
pancreatic anastomosis. Other techniques for reconstruction of the distal stump using jejunum or stomach have been described.
One or two soft drains are brought out on the right side. The fluid collected from this drain is checked for amylase level on
postoperative days 3, 5, and 7; if the level is low or absent, the drain is removed. Central pancreatectomy is a safe technique for
benign or low malignant tumors of the pancreatic neck that allows curing the tumor with evident functional results without
increasing the risk for the patient. We can say that CP has a clear role like pancreaticoduodenectomy and distal pancreatectomy
and we think that a pancreatic surgeon has to include this procedure in his/her technical skills. In order to obtain excellent results,
correct indications and experience in pancreatic surgery are recommended
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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