1,720,981 research outputs found
PCNL: tips and tricks in targeting, puncture and dilation
No full textGetting an effective and safe percutaneous access is the cornerstone in performing a successful and uneventful PCNL. The choice of the puncture site, according to our experience, is one of the most important factors that may influence the outcome of the procedure Preoperative imaging has a preliminary role in choosing the kind of approach but the most important role has to be given to intraoperative retrograde pyelography following occlusion balloon catheter placing. Ultrasound-guided renal puncture as well may show adequate anatomic details of the collecting system if a retrograde dilation is performed We routinely perform a single subcostal lower pole access. In our opinion, when the skin incision is located into the four-sided space between 12thrib, spine muscles, iliac crest and posterior axillary line, the risk of most non-haemorrhagic complications may be reduced. When the needle is proceeding towards its target, some radiological sign may confirm its correct insertion Dilation and operative sheath placing are the last steps of the percutaneous tract creation. Amongst the wide offer of dilating devices, our choice usually goes to the Amplatz fascial dilators associated to the "one-shot" technique and to the balloon hydraulic dilators
Trattamneto della litiasi in calici con asse infundibulare ad angolo acuto rispetto al calice di ingresso nella litotrissia percutanea endorenale
No full text
Two cases of bovine aortic arch variant detected with Multi-detector-row CT angiography. Description and review of the literature
No full textWe report the multi-detector-row ct-angiography (MDCTA) findings of two patients with an uncommon origin of the left common carotid artery from the innominate artery. Post-processed images clearly show the anomaly of origin. In one case we observe also an important stenosis located at the left internal carotid artery origin. In the second part of this paper we review the literature about this type of vascular variant. A through knowledge of these anatomic variants and the potential vascular pathologies that may potentially coexist, is necessary before treating the aortic arch vessels
Morfologia e meccanismi di crescita per alcune eccentriche aragonitiche della grotta di Is Zuddas a Santadi (Sardegna, Italia)
No full textMorphology and growth mechanisms of some aragonitic helictites
from Is Zuddas cave at Santadi (Sardinia, Italy)
Some aragonitic helictites from Is Zuddas cave are described in terms
of morphology and growth mechanisms involved. The importance of
the cross-section shape of the internal micro-canal in controlling the
direction of growth of the main branch, as well as of possible secondary
branches, is highlighted
Computer-aided detection of pulmonary nodules in computed tomography: analysis and review of the literature
No full textPURPOSE:
To evaluate diagnostic sensitivity of the pulmonary nodules computer-aided detection (CAD) in computed tomography. To analyze parameters that modify CAD performance. We made a critical analysis of the literature, and we described CAD sensitivity. Moreover, we compared CAD and CAD plus radiologist sensitivity in detection of pulmonary nodules, and we compared different acquisition techniques (thin slice vs thick slice and low dose vs normal dose).
MATERIALS AND METHODS:
We used as major data sources the medical literature database of PubMed and MEDLINE, where we searched for articles in English language published from January 2001 to November 2006. We included studies that used spiral or multidetector row CT for CAD.
RESULTS:
Twenty studies met the inclusion criteria containing a total of more than 827 patients and 2717 pulmonary nodules detected by CAD. We observed an overall sensitivity of 79% for the CAD and of 92% for CAD plus radiologist; CAD sensitivity was 80% and 74% for thin slice and thick slice protocols, respectively.
CONCLUSIONS:
Results of our study suggest that CAD technique is an accurate tool in detection of pulmonary nodules, by working as useful second look for the physician. Sensitivity becomes higher by using it together with radiologist. Actually, the main limitation about the use of CAD to be solved is represented by the persistent high false-positive rate
Il ricco patrimonio speleotemico della Grotta di Is Zuddas (Santadi, Sardegna sud-occidentale)
No full textIs Zuddas is the only show cave in the Sulcis region and is renowned for its helictites. The cave develops
over 1500 m in Cambrian dolostones of Monte Meana (Santadi, SW Sardinia). This carbonate hill
hosts important subterranean karst phenomena comprising several other caves. From the middle of the
1980's the cave is managed by the Cooperative Monte Meana that has made a part of the underground
tunnels and rooms accessible installing stairs, pathways and artificial illumination. In this study, in the
framework of a BSc thesis in Geological Sciences at the University of Cagliari, the mineralogical characteristics
of many types of speleothems discovered in both tourist and wild parts of the cave are presented.
These formations are classified according to the morphological classification proposed by Hill & Forti
(1997). Some considerations on the way these helictites change direction and ramify are made. The cave
is renowned for its abundance of helictites, but a detailed study has recognised a great variety of different
speleothems, reaching a total of 29 types, some of which are common forms, others are rather seldom morphologies.
For what concerns mineralogy, besides calcite and aragonite, Mg-calcite, huntite, dolomite, barite,
gypsum, hydromagnesite, quartz and some clay minerals have been found
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