1,720,956 research outputs found
Giant cell granuloma of the temporal bone: A case report
No full textPROBLEM: Giant cell granuloma (GCG) is a rare nonneoplastic bone lesion that occurs mostly in the jawbones; few cases arise in the remainder of the skull, including the temporal bone. Previously, giant cell lesions of the temporal bone were regarded as giant cell tumours (GCT). The importance of distinguishing GCG from GCT lies in the presumed difference in prognosis; GCTs have higher rates of recurrence, metastasis, and malignant transformation. METHODOLOGY: We describe the case of a 12-year-old child with temporal bone GCG extending to the middle cranial fossa. The patient underwent a subtotal petrosectomy via retroauricular approach, associated with resection of the zygomatic process. RESULTS: No evidence of recurrence was found 36 months later. CONCLUSION: The diagnosis of GCG was based on clinical history, histology, imaging, and response to treatment. The patient was treated with the standard surgical approach, and has a good outcome at three years follow-up
Aberrant internal carotid artery in the middle ear: two case reports.
No full textOBJECTIVE: To describe the clinical and radiological features of the vascular anomaly, aberrant internal carotid artery (ICA) in the temporal bone. METHODOLOGY: Case reports on two patients. RESULTS AND CONCLUSIONS:
Aberrant ICA in the middle ear is a rare congenital abnormality usually identified on a computed tomographic scan before beginning middle ear surgery. Misdiagnosis may lead to serious surgical complications such as major bleeding, or even neurological deficit due to endovascular occlusion
Giant cell granuloma of the temporal bone: a case report.
No full textPROBLEM: Giant cell granuloma (GCG) is a rare nonneoplastic bone lesion that occurs mostly in the jawbones; few cases arise in the remainder of the skull, including the temporal bone. Previously, giant cell lesions of the temporal bone were regarded as giant cell tumours (GCT). The importance of distinguishing GCG from GCT lies in the presumed difference in prognosis; GCTs have higher rates of recurrence, metastasis, and malignant transformation. METHODOLOGY: We describe the case of a 12-year-old child with temporal bone GCG extending to the middle cranial fossa. The patient underwent a subtotal petrosectomy via retroauricular approach, associated with resection of the zygomatic process. RESULTS: No evidence of recurrence was found 36 months later. CONCLUSION: The diagnosis of GCG was based on clinical history, histology, imaging, and response to treatment. The patient was treated with the standard surgical approach, and has a good outcome at three years follow-up
Speech recognition with BAHA simulator in subjects with acquired unilateral sensorineural hearing loss.
No full textCONCLUSION:We question the justification for the cost of a surgically implanted device for the restoration of limited circumstances of audible communication, although we understand that the decision is taken depending on the social relevance of communication or personal criteria.
OBJECTIVES:The purpose of this study was to evaluate the effect of the BAHA simulator (BAHAS) system in subjects with acquired unilateral sensorineural hearing loss. In particular we tested the changes of speech reception threshold (SRT) in relation to different speech source positions, with a background of diffuse noise.
METHODS:The primary message consisting of lists of Italian sentences was delivered from a loudspeaker placed at horizontal azimuths of 0°, 90°, 180° and 270°; the interference consisted of uncorrelated speech-shaped noise simultaneously delivered by four loudspeakers at a fixed intensity. The speech recognition tests were administered to 11 patients with BAHAS either on or off; hence each patient underwent 8 acoustic conditions (4 primary message directions × 2 BAHAS conditions). The SRT (50% correct responses) was measured by a simple 2 dB step adaptive procedure. Ten normal-hearing subjects served as the control group.
RESULTS:Our data demonstrated that even for the acoustic condition where BAHAS should be more useful (i.e. lateral speech toward the impaired side), it was definitely ineffective in the study conditions
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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