1/11. Celiomesenteric anomaly demonstration by multidetector CT and volume rendering.Preoperative knowledge of vascular anomalies is critical to planning a surgical approach. We present a case of celiomesenteric anomaly. Multidetector CT and volume rendering give high quality angiograms and a multitude of perspectives that facilitate depiction and understanding of such anomalies.- - - - - - - - - - ranking = 1keywords = volume (Clic here for more details about this article) |
2/11. Preoperative evaluation of neurovascular compression in patients with trigeminal neuralgia by use of three-dimensional reconstruction from two types of high-resolution magnetic resonance imaging.OBJECTIVE: To assess the value of three-dimensional (3-D) images reconstructed from 3-D constructive interference in steady state (3-D-CISS) and 3-D fast inflow with steady-state precession (3-D-FISP) images for the visualization of neurovascular compression in patients with trigeminal neuralgia. methods: Twenty-four consecutive patients with trigeminal neuralgia underwent preoperative 3-D-FISP and 3-D-CISS imaging. 3-D reconstruction of nerves and vessels was performed with the use of a volume-rendering method. We compared the 3-D reconstructed images with intraoperative findings. RESULTS: 3-D-CISS and 3-D-FISP images scanned from the same position clearly delineated the trigeminal nerve and vessels. 3-D reconstructed images showed the spatial relationship between the trigeminal nerve and causative vessels. The responsible arteries were identified from the 3-D reconstructed images, which closely simulated the microscopic operative view. CONCLUSION: 3-D reconstructions from two types of high-resolution magnetic resonance images (3-D-CISS and 3-D-FISP) are very useful for creating preoperative simulations and in deciding whether to perform surgery in patients with trigeminal neuralgia.- - - - - - - - - - ranking = 0.2keywords = volume (Clic here for more details about this article) |
3/11. dialysis access-associated steal syndrome: the intraoperative use of duplex ultrasound scan.dialysis access-associated steal syndrome (DASS) is an uncommon but serious complication after the creation of an arteriovenous shunt for hemodialysis and is related to an excess perfusion of the fistula. Several surgical options have been described for DASS correction. To achieve an adequate distribution of the blood flow towards the fistula and the hand, intraoperative duplex ultrasound scan monitoring was used in this preliminary communication to control the surgical reduction of volume flow through the fistula. The shunt flow was not estimated with direct insonation of the shunt but calculated from the difference of the bilateral subclavian artery volume flow rates. This new technique has several advantages over a direct shunt evaluation that are discussed in this report. Three patients with DASS are described in whom the technique was successfully applied and led to a normalization of the hand perfusion and to the maintenance of a long-term patency of the fistula.- - - - - - - - - - ranking = 0.4keywords = volume (Clic here for more details about this article) |
4/11. Novel technique for diagnosis and management of Fraley's syndrome: helical CT with three-dimensional volume rendering.We report on the diagnosis and minimally invasive management of Fraley's syndrome using helical CT with volume-rendering techniques in an 18-year-old patient. Three-dimensional images were generated rapidly and allowed safe planning and execution of a laser infundibulotomy of the upper-pole calix. After 24 months of follow-up, the patient remains pain free.- - - - - - - - - - ranking = 1keywords = volume (Clic here for more details about this article) |
5/11. Paradoxical ventricular septal motion with right ventricular dilatation as a manifestation of pure pressure overload due to pulmonary veno-occlusive disease.Paradoxical interventricular septal motion with right ventricular dilatation has been considered the hallmark of right ventricular volume overload. We report a 43-year-old woman with severe pulmonary hypertension due to pulmonary veno-occlusive disease who exhibited these echocardiographic abnormalities. Right ventricular volume overload was excluded by physical examination, echocardiography with saline contrast study and by cardiac catheterization, angiography, and shunt study. These echocardiographic findings are thus not pathognomonic of right ventricular volume overload and can be seen with pressure overload as well.- - - - - - - - - - ranking = 0.6keywords = volume (Clic here for more details about this article) |
6/11. The portal vein as collateral in inferior vena cava obstruction.In five patients with obstruction of the inferior vena cava, collateral flow to the portal vein was demonstrated. Although there are many reports on caval occlusion, only 21 cases with this collateral circulation pattern have been reported. The reasons for this are most likely technical: To demonstrate this circulation, a large volume of contrast medium must be used and, because of the low flow velocity in the numerous wide collaterals, delayed films are also necessary.- - - - - - - - - - ranking = 0.2keywords = volume (Clic here for more details about this article) |
7/11. Effect of therapy with the pneumatic end-diastolic leg compression boot on peripheral vascular tests and on the clinical course of peripheral vascular disease.The Circulator Boot is a new end-diastolic pneumatic leg compression device. This report describes its effect on 6 normal young people, 8 ambulatory patients with mild peripheral arterial disease, and 21 consecutive patients (of whom 18 were hospitalized) with severe peripheral arterial disease in 25 legs. The courses of 4 patients are discussed in detail. Significant beneficial effects were documented by subcutaneous PO2 levels, pulse volume measurements, ankle blood pressure measurements, and Doppler ultrasound tracings. Twenty-two of the 25 severe legs benefitted clinically from therapy. Immediate therapeutic effects from the boot are attributed to decreases in venous pressure, interstitial fluid pressure, vasoconstriction, and viscosity, and to increases in cardiac output, pulse pressure, and fibrinolysis in the treated leg. The long-term beneficial effects of boot therapy may be related to improved collateral flow and to the rechanneling of obstructed vessels.- - - - - - - - - - ranking = 0.2keywords = volume (Clic here for more details about this article) |
8/11. Spiral CT. Initial experience with vascular applications.Spiral computed tomography (CT) scanning is the latest technical advance in rapid scan techniques. In spiral CT, the patient is advanced at a constant rate through a continuously rotating CT gantry. The resulting CT data represent a true volume acquisition. Because of rapid scan acquisition, optimum vascular enhancement by intravenous or intraarterial contrast can be readily achieved. In addition, high quality multiplanar and three-dimensional reconstructions can be obtained because of lack of respiratory motion. Applications of spiral CT for vascular studies include evaluation of thoracic or abdominal aneurysms, vascular occlusion from thrombus or tumor, and vascular malformations. In this article, we present vascular applications of spiral CT through a series of illustrative cases.- - - - - - - - - - ranking = 0.2keywords = volume (Clic here for more details about this article) |
9/11. In utero development of pulmonary artery calcification in monochorionic twins: a report of three cases and discussion of the possible etiology.pulmonary artery (PA) calcification is unusual in children, reportedly occurring only in conjunction with severe underlying valvular disease. Three newborns were found by chest X-ray study to have thin calcified rings of the PA. Two were pump twins in twin reversed arterial perfusion (TRAP) sequences, each with an acardiac cotwin, and the third was the recipient in a twin transfusion syndrome (TTS). Both twin pairs with TRAP sequence were premature, each pump twin presenting with cardiac decompensation. One remained well at 5 months of age, the other died at 5 1/2 months of age. The third, the premature recipient of twins with TTS, died at 24 h of age, and the donor cotwin died at 2 h of age. The two hearts were structurally normal at autopsy. Subtle intimal wrinkling was seen above the pulmonary valve leaflets, and the media was yellow and granular on cut section. hyperplasia of the intima and media with disruption and calcification of the elastic fibers of the media was seen microscopically. These three cases of PA calcification occurring in utero were not related to structural valvular abnormalities but were presumably due to increased cardiac output in utero as each occurred in the volume-overloaded twin of the twin pair. Comparison of the weight differences between these three twin pairs with PA calcification suggests a relationship between the presence of PA calcification and the severity of the cardiac volume overload. In utero cardiac damage may contribute to the high morbidity and mortality rate seen in infants with TRAP sequence and TTS.- - - - - - - - - - ranking = 0.4keywords = volume (Clic here for more details about this article) |
10/11. Leech therapy in the management of acute venous congestion of an infant's lower limb.We report the successful use of leech therapy in the postsurgical management of an infant with acute venous congestion of an entire lower limb. Two days of constant leech therapy, followed by 5 days of intermittent application, decongested the affected tissues. There were no complications related to the leech therapy, and mild cutaneous hyperpigmentation was the only long-term complication of the acute venous congestion. The volume of the affected tissue may limit the success of leech therapy in cases of acute venous congestion in the limbs of adults. Nevertheless, the use of leeches to manage acute venous congestion of large portions of infants' bodies should be considered when surgical therapies are not feasible.- - - - - - - - - - ranking = 0.2keywords = volume (Clic here for more details about this article) |
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