1,720,964 research outputs found
Post-operative splenic arteriovenous fistula detected with 16-multidetector computed tomography
No full textEvidence based medicine: role of multidetector CT in the follow-up of patients receiving coronary artery bypass graft
No full textMagnetic resonance imaging of pure ovarian dysgerminoma: a series of eight cases
Full text linkBackground: Imaging findings have a prominent role in early and correct identification of ovarian dysgerminoma, the most common ovarian malignant germ cell tumor (OMGCT). Despite Computed Tomography (CT) is widely used, Magnetic Resonance Imaging (MRI) has proved to be superior in adnexal masses characterization. Limited data and small series are available concerning MRI aspects of dysgerminoma. Case presentation: From January 2012 to December 2018, a database of solid ovarian masses was retrospectively reviewed. Eight patients with histologically proven pure ovarian dysgerminoma and complete imaging available were identified and analyzed. Imaging findings were evaluated separately by two radiologists expert in female genito-urinary MRI. Conclusions: MRI findings of a lobulated, purely solid, encapsulated mass with hyper-intensity of lobules and hypo-intensity of septa on T2w images contribute to differentiate dysgerminomas from other ovarian neoplasms
CT angiography versus colour-Doppler US in acute dissection ofthe vertebral artery.
No full textPurpose. Conventional digital subtraction angiography (DSA) still
represents the criterion standard for the diagnosis of vertebral
artery dissection (VAD), but the main drawbacks of this technique
include invasiveness, patient discomfort and risk of complications.
We evaluated the potential of multidetector computed tomography
angiography (CTA) as a noninvasive tool providing highresolution
images of the arterial lumen and wall by comparing the
diagnostic accuracy of CTA and colour-Doppler ultrasonography
(CDUS) in detecting acute VAD.
Materials and methods. We retrospectively reviewed 15 cases of
VAD in 15 patients (five men and ten women, age range 28–58
years) who came to our attention between August 2001 and
September 2005. The diagnosis was made on the basis of
appropriate clinical presentation, absence of atherosclerotic
disease in the cerebrovascular circulation and evidence of
distinctive CT features, which were subsequently confirmed by
conventional angiography used as reference standard. All patients
with a clinical suspicion of VAD underwent CDUS of the neck
vessels prior to CTA. Accuracy, sensitivity and specificity of
CDUS and CTA were expressed as percentages of agreement with
the reference angiographic procedure. Interreader concordance for
detection of VAD by CTA was calculated with the Cohen K value.
Results. The CDUS examinations revealed ten out of 15 VAD,
with a sensitivity of 66%, a specificity of 60%, a positive
predictive value of 55.5% and a negative predictive value of
70.5%. In five cases, CDUS revealed nonspecific wall and flow
alterations; in eight patients, high resistance obstructive flow;
and in two patients, intimal flap with demonstration of the true and
false lumen. CTA enabled the correct identification of all 15
VAD. The reported sensitivity, specificity, positive predictive
value and negative predictive value were 100%, 95%, 93.7%
and 100%, respectively. With regard to localisation of VAD,
CTA showed 100% correlation with DSA. The differences in CTA
and CDUS sensitivity (100% vs 66%), specificity (95% vs 60%),
and overall diagnostic accuracy (97% vs 62.8%), assessed by
cross tabulations and compared by using the McNemar’s
two-sided test, were significant (p<0.05).
Conclusions. Multidetector CTA is a sensitive technique for the
diagnosis of VAD. Used as a complement to unenhanced brain
CT, it has the advantage of being readily available and easy to
perform
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
ECR 2005 - European Congress of Radiology - Role of US in the evaluation of dorsal scapholunate ganglion cyst
No full textVariations 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
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