1,721,777 research outputs found
Middle ear and mastoid glomus tumors (glomus tympanicum): An algorithm for the surgical management.
No full textAuris Nasus Larynx. 2010 Dec;37(6):661-8. Epub 2010 Apr 18.
Middle ear and mastoid glomus tumors (glomus tympanicum): an algorithm for the surgical management.
Sanna M, Fois P, Pasanisi E, Russo A, Bacciu A.
SourceGruppo Otologico, Piacenza-Rome, Italy.
Abstract
OBJECTIVE: Glomus tumors are slow-growing benign lesions and represent the most common primary neoplasms of the middle ear. The objective of the present study is to report our surgical strategy in the management of glomus tympanicum tumors.
METHODS: Between December 1988 and July 2008, 68 patients with histologically confirmed glomus tympanicum tumor underwent surgical treatment. The follow-up of the series ranged from 6 to 194 months (mean, 33.4 months).
RESULTS: Distribution of tumors according to Fisch and Mattox classification was as follows: type A, 44 cases (64.7%); type B, 24 cases (35.3%). All of the 44 Class A tumors were safely removed via either a stapedectomy-type transcanal approach or a retroauricolar-transcanal approach. Five patients with Class B tumors were operated on through a transmastoid approach. Nineteen patients with larger Class B tumors underwent a subtotal petrosectomy with blind sac closure of the external auditory canal and middle ear obliteration. Gross total tumor removal was achieved in all 68 cases. In one case (1.4%) there was recurrence after 9 years, for which the patient was re-operated. No residual/recurrence has been detected on computed tomography in the rest of the patients.
CONCLUSION: Surgical excision of glomus tympanicum tumors is a safe procedure, allowing total tumor removal with minimal morbidity, a low recurrence rate, and a low complication rate
POSTERIOR PETROUS FACE MENINGIOMAS:AN ALGORITHM FOR SURGICAL MANAGEMENT.
No full textOtol Neurotol. 2007 Oct;28(7):942-50.
Posterior petrous face meningiomas: an algorithm for surgical management.
Sanna M, Bacciu A, Pasanisi E, Taibah A, Piazza P.
SourceGruppo Otologico, Piacenza-Rome, Italy. [email protected]
Abstract
OBJECTIVE: The objective of the present study was to report our surgical strategy in the management of 81 patients with posterior petrous face meningiomas.
STUDY DESIGN: Retrospective study.
SETTING: This study was conducted at a quaternary private otology and cranial base center.
PATIENTS: Of 139 patients with posterior fossa meningioma, 81 occurred on the posterior petrous face of the temporal bone and were the object of this study.
INTERVENTIONS: Thirty-one patients were approached by the enlarged translabyrinthine approach. The enlarged translabyrinthine approach with transapical extension Type II was performedin 29 patients. The combined retrosigmoid-retrolabyrinthine approach was chosen in 8 cases. The modified transcochlear approach Type A with permanent posterior transposition of the facial nerve (FN) was performed in 6 patients. Two patients underwent a retrolabyrinthine subtemporal transapical approach. One patient underwent a transpetrous middle cranial fossa approach. Four patients with intracanalicular meningiomas were operated on through the enlarged middle cranial fossa approach.
RESULTS: Total removal of the tumor (Simpson Grades I and II) was achieved in most patients (92.5%). The FN was anatomically preserved in 79 of the 81 (97.5%) patients. Five patients had less than 1 year follow-up, and 2 patients were lost to follow-up and were excluded in evaluation of the final FN outcome. At 1-year follow-up, 46 patients (63%) had Grade I to II, 19 (26%) had Grade III, 4 (5.4%) had Grade IV, 1 (1.3%) had Grade V, and 3 (4.1%) had Grade VI. Hearing-preserving surgery was attempted in 15 patients (18.5%) with preoperative serviceable hearing. Of these 15 patients, 11 had their hearing preserved at the same preoperative level, and 4 experienced postoperative deafness. Postoperatively, a new deficit of 1 or more of the lower cranial nerves was recorded in 3 patients. One patient experienced subcutaneous cerebrospinal fluid collection that required surgical management.
CONCLUSION: Total tumor removal (Simpson Grades I-II) remains our treatment of choice and takes priority over hearing preservation. Subtotal resection is indicated for older and debilitated patients with giant lesions to relieve the tumor compression on the cerebellum and brainstem. Subtotal removal is also preferred in the face of the absence of a plane of cleavage between the tumor and the brainstem, in the presence of encasement of vital neurovascular structures, in elderly patients with tumors adherent to preoperatively normal facial or lower cranial nerves
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
Chondrosarcomas of the jugular foramen.
No full textLaryngoscope. 2008 Oct;118(10):1719-28.
Chondrosarcomas of the jugular foramen.
Sanna M, Bacciu A, Pasanisi E, Piazza P, Fois P, Falcioni M.
SourceOtology, Neurotology and Skull Base Surgery, Gruppo Otologico, Piacenza, Italy. [email protected]
Abstract
OBJECTIVES/HYPOTHESIS: Chondrosarcomas of the jugular foramen are extremely rare tumors. Our review of the literature revealed eleven previously reported cases. The aim of this study is to describe the presenting symptoms, radiographic findings, operative procedures, and postoperative outcome of five histologically confirmed cases of chondrosarcomas arising from the jugular foramen. A review of the literature is also presented.
STUDY DESIGN: Retrospective study of an quaternary referral otology and skull base private center.
METHODS: Five cases of surgically treated and pathologically confirmed jugular foramen chondrosarcomas were identified. The follow-up of the series ranged from 23 to 42 months (mean, 32.8 +/- 7.7 months).
RESULTS: A single stage procedure was adopted in all the cases. Two patients underwent type A infratemporal approaches, one patient underwent a transotic approach extending to the neck with ligature of the internal jugular vein, one patient underwent a petro-occipital transigmoid approach, and one patient underwent a combined petro-occipital transigmoid-transotic approach. Gross total tumor removal was achieved in all patients. The most common complications were lower cranial nerve deficits. To date, no recurrence or residual tumors have been observed at radiological controls.
CONCLUSIONS: We believe that the primary treatment for chondrosarcomas of the jugular foramen is gross total surgical resection of the tumor. It is our philosophy to reserve postoperative radiotherapy for patients with histologically aggressive tumors, as well as in cases with subtotal resection and recurrent tumors
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
Fourth dimension for representing and communicating architectural heritage
Full text linkIn the last years dynamic and hyper-medial representations have burst on the scene of the traditionally static architectural representation methods, thanks to the most recent technological developments in the field of computer graphics. Advanced digital media techniques and dynamic representations are establishing as primary emerging modes of architectural representation, using different techniques such as 3D modelling, animation, montage, virtual and augmented realities and other digitally based techniques.
This phenomenon has involved, with different aims and results, both the process and divulgation of design and the analysis and documentation of heritage.
Meaning the representation of architectural heritage as a heuristic and interpretative method, and the communication as a conveying of knowledge tool, the introduction of the time dimension acts as a new powerful medium and a suitable tool to interpret the complexity of reality.
In this paper we will develop some considerations about the surplus value by means of fourth dimension, in representation and communication of cultural heritage, referring to its different expressions and levels of immersiveness.
The aim of this research is to express, starting from the analysis of some case studies, some proposals useful to researchers using dynamic representations of architectural heritage to increase the heuristic and communicative and expressive capabilities of their analysis
La modellazione digitale ricostruttiva: il caso della chiesa della Misericordia a Torino
No full textIl lavoro è volto all'analisi delle più recenti tecniche di modellazione digitale, basata sui dati eterogenei di rilievo (stazione totale, laser scanner, rilievo manuale, fotografico,...) per una fedele ricostruzione formale e materica di un manufatto oggetto di vincolo. Il risultato di questa operazione costituirà la base dati per le successive operazioni di restaur
Digital modelling for architectural reconstruction. the case study of the Chiesa Confraternita della Misericordia in Turin
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