1,720,955 research outputs found
Surgical strategy in treatment of metopic synostosis in a single centre experience: technical note and quantitative analysis of the outcomes.
No full textTrigonocephaly is the most common craniosynostosis involving orbits. Although some degree of agreement has been reached regarding surgical timing and indications for treatment, there is no consensus regarding the ideal operative technique to guarantee an optimal morphological outcome. The purpose of this study is to describe both strategies and to compare morphological outcomes by means of morphological surface analysis obtained from three-dimensional (3D) stereophotogrammetry, with two different techniques. We retrospectively investigated 43 patients with metopic synostosis surgically treated between 2004 and 2020. Two different techniques were applied, addressed as technique A and B. Ten patients undergone postoperative 3d stereophotogrammetry were enrolled, and cephalometric measurements were taken and compared to a cohort of unaffected patients matched by age and gender. Comparison of the groups demonstrated a hypercorrection of the metopic angle of the second technique, associated with a slightly lower correction of the interfrontoparietal diameter. The metopic angle showed to be significantly undercorrected with the first method. Alternated barrel staving technique appears to be a quick and satisfactory method in cranial remodelling for metopic synostosis. It guarantees an optimal aesthetic result in the first years after surgery. [Abstract copyright: © 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
Congenital cystic eye: from prenatal diagnosis to therapeutic management and surgical treatment
No full textOnly 28 cases of congenital cystic eye have been reported in the literature. The main issue in such cases is differential diagnosis between this malformation and different cystic malformations and masses of the orbital cavity and eyeball, the most common of which is microphthalmia with cyst. Both malformations arise from incomplete closure of the fetal optic vesicle in different stages of embryonic development. We present a case of congenital cystic eye, associated with coloboma and corneal dermoid of the fellow eye and with left brachiocephaly, discussing differential diagnosis with microphthalmia with cyst and illustrating the treatment we planned and performed. The patient first underwent a surgical excision of the left corneal dermoid, then a resection of the right orbital cyst. The last step was to perform a craniotomy and cranial vault remodeling. All the operations were planned and performed using a team approach. The team comprised an ophthalmologist, a plastic surgeon, and a neurosurgeon, and the result was a successful outcome
Intracranial tumors during the 1st year of life
No full textTwenty-eight patients with intracranial tumors symptomatic during the 1st year of life were managed from January 1970 to March 1988. Supratentorial location (19 cases) was dominant over the infratentorial. The most common histological type was astrocytoma; choroid plexus papilloma and ependymal tumors followed in frequency. Twenty-two infants (78.6%) had association hydrocephalus. Macrocrania, vomiting, delayed milestones, and behavioral disturbances were the chief clinical manifestations. Four patients were admitted in extremely deteriorated condition and died preoperatively. Twenty cases underwent surgery for tumor removal with a 1-month mortality rate of 20%. Tumor excision provided permanent relief of hydrocephalus in the majority of the surviving cases. Five patients received conventioal radiotherapy. Stereotactic brachytherapy yielded an excellent result in 1 case. Overall 13 cases are currently alive; 6 of them have survived longer than 6 years. Fourteen of the 15 patients who ..
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
Introduction of percutaneous-tunneled transfontanellar external ventricular drainage in the management of hydrocephalus in extremely low-birth-weight infants
No full textObjective: Hydrocephalus treatment in extremely low-birth-weight (ELBW) infants still represents a challenge for the pediatric neurosurgeon, particularly when the patient weighs far less than 1000 g. In such cases, the benefits in terms of neurological outcome following early treatment do not always outweigh the surgical risks, especially considering the great difference in the surgical risk before patient weight increases. To assess the efficacy and reliability of a percutaneous-tunneled, transfontanellar external ventricular drain (PTTEVD) in ELBW infants, the authors started a new protocol for the early surgical treatment of hydrocephalus. Methods: Ten cases of posthemorrhagic hydrocephalus (PHH) in ELBW infants (5 cases < 700 g, range for all cases 550-1000 g) were treated with a PTTEVD that was implanted at bedside as the first measure in a stepwise approach. Results: The average duration of the procedure was 7 minutes, and there was no blood loss. The drain remained in place for an average of 24 days (range 8-45 days). In all cases early control of the hydrocephalus was achieved. One patient had a single episode of CSF leakage (due to insufficient CSF removal). In another patient Enterococcus in the CSF sample was detected the day after abdominal surgery with ileostomy (infection resolved with intrathecal vancomycin). One patient died of Streptococcus sepsis, a systemic infection existing prior to drain placement that never resolved. One patient had Pseudomonas aeruginosa sepsis prior to drain insertion; a PTTEVD was implanted, the infection resolved, and the hydrocephalus was treated in the same way as with a traditional EVD, while the advantages of a quick, minimally invasive, bedside procedure were maintained. Once a patient reached 1 kg in weight, when necessary, a ventriculoperitoneal shunt was implanted and the PTTEVD was removed. Conclusions: The introduction of PTTEVD placement in our standard protocol for the management of PHH has proved to be a wise option for small patients
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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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