1,720,965 research outputs found
Facial sinus endoscopic evaluation, radiologic assessment, and classification
Full text linkObjectives: To describe facial sinus anatomy from an endoscopic perspective and present a radiologic classification. Methods: Facial sinus was studied by endoscopy and high-resolution computed tomography (HRCT) scan in 39 temporal bones that underwent exclusive transcanal endoscopic approach. A radiomorphologic classification based on the relationship between the facial sinus and the mastoid portion of the facial nerve is created as follows. In type A facial sinus, the pneumatization of the facial sinus did not extend medially or posteriorly to the mastoid portion of the facial nerve. In type B facial sinus, the pneumatization extended posteriorly to the mastoid portion of the facial nerve. In type C facial sinus, the pneumatization extended posteriorly and medially to the mastoid portion of the facial nerve. Results: In all the specimens that underwent HRCT (n = 31), facial sinus could be identified, and its depth classified, in relation to the facial nerve. In this group, 58% type A, 29% type B, and 13% type C facial sinuses were identified. In all the specimens (n = 39), the facial sinus could be assessed by means of an exclusive endoscopic transcanal approach, and anatomical variants of the chordiculus, previously known as chordal ridge, could be described: ridge (39%), bridge (18%), incomplete (15%), and absent (28%). Conclusion: Endoscopic exploration of the retrotympanum guarantees a very good exposure of the facial sinus, allowing detailed anatomic descriptions of its conformation and relationships with other structures. Improvement in our knowledge of its anatomy might decrease the possibility of residual disease during cholesteatoma surgery. Angled endoscopes (e.g. 45 °, 70 °) can guarantee a better view of the facial sinus. Level of Evidence: NA. Laryngoscope, 128:2397–2402, 2018
Ocular neuromyotonia with both tonic and paroxysmal components due to vascular compression
No full text
Post-infectious and postvaccinal acute disseminated encephalomyelitis occurring in the same patients
No full textWe here describe 2 patients, previously
affected by post-infectious
encephalomyelitis and myelitis, relapsing
after flu immunisation; this
observation suggests that post-infectious
and post-vaccinal cases
may share common pathogenetic
mechanisms, reinforcing the debated
issue of ADEM as an autoimmune
disease
CT morphological evaluation of anterior epitympanic recess in patients with attic cholesteatoma
No full textThe objective of this study is to analyze the possible variations in size and shape of the AER in the ear affected by acquired cholesteatoma versus the healthy ear in the same patient. A total of 22 patients affected by acquired cholesteatoma were included in our study. A CT morphological evaluation of both ears (pathologic and non-pathologic) was made. Measures of the AER were done, on axial plane, parallel to incudomalleal axis for the deepest anterior-to-posterior (AP) diameter and perpendicular to this line for the maximum transverse (T) diameter, selecting the most inferior cut that showed the Cog in its entirety. A third superior-inferior (SI) measure was done, on coronal plane from the tegmen tympani to the cochleariform process. Comparisons between the mean of AP, T and SI in affected ears versus non-affected have been carried out using a paired t test. The AER measurement was considerably smaller in affected ears than in the non-affected ones. Mean AP +/- DS was 5.1 (1.46) versus 3.1 (0.90), P values <0.0001. Mean T +/- DS was 4.1 (0.74) versus 3.2 (0.74), P values <0.0014. Mean SI +/- DS was 4.0 (1.01) versus 2.0 (0.82), P values <0.0001. In conclusion, based on our results, the AER in an affected ear seems smaller than in a non-affected one. Whether a hypovolumetric AER could be a congenital morphological condition predisposing cholesteatoma despite adequate aeration of the epitympanic compartment, on the contrary the presence of membranous and/or ligamentous folds could exclude the AER from the posterior epitympanic space and from the protympanum, predisposing it for attical dysventilation, should be clarified in further studies
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
Transcanal surgery for vestibular schwannomas: a pictorial review of radiological findings, surgical anatomy and comparison to the traditional translabyrinthine approach
Full text linkThe most popular approaches for vestibular schwannoma (VS) removal are retrosigmoid, middle cranial fossa and translabyrinthine (TL). All require a certain degree of invasivity, bone removal, or brain manipulation. Recently, the authors described the transcanal transpromontorial approaches (TTA), which allow the inner ear to be accessed directly through the external auditory canal (EAC), either with a microscopic (Expanded TTA, or ExpTTA) or even an exclusive endoscopic technique (Endoscopic TTA, or EndoTTA). The advantages compared to traditional approaches are a direct view of the internal auditory canal (IAC) from lateral to medial, very little or no superficial tissue dissection and very little petrous bone drilling. In summary, from an anatomical point of view, they could be considered to be minimally invasive approaches. The radiologic outcome and the anatomical correspondence of these new approaches are described so as to share with the readers the possible radiologic findings and to compare and differentiate them from classic transpetrous approaches such as the TL approach
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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