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Texas Heart Institute

On contrast-enhanced CT, the venous collector of the DVA is readily detectable as a linear or curvilinear focus of enhancement, typically coursing from the deep white matter to a cortical vein or a deep vein or to a dural sinus. On MRIs, DVAs typically have a transhemispheric flow void on both T1- and T2-weighted images. After the administration of gadolinium, because of the slow flow, significant enhancement of the caput medusae of the medullary veins and venous collector are observed. Digital subtraction angiography is rarely necessary to diagnose a DVA. Classical angiographic appearance is that of a caput medusae appearance of transmedullary veins visualized during the early to middle venous phase, draining into a large venous collector, which can extend either to the superficial or deep venous system depending on the type of the DVA.

DVAs are classified as deep (ie, draining into deep subependymal veins and the galenic system) or superficial (ie, draining into cortical veins). In 70%, the latter pattern is present, deep drainage is found in 20%, whereas a combination of deep and superficial drainage occurs in 10%. 2,39 Apart from the classical appearance, complex DVAs can have multiple collectors, drain a large area, and can be associated with both deep and superficial drainage. In general, DVAs occur most often in the frontal lobe (36% to 56%) followed by the parietal (12% to 24%), occipital (4%), and the temporal lobes (2% to 19%); the cerebellum (14% to 29%); the basal ganglia (6%); the thalamus, the ventricles (11%); and the brainstem (less than 5%). 2,39

Radiological and autopsy series demonstrated that DVAs occur in 2.5% to 3% of the population and they are the most common vascular “malformation” of the central nervous system constituting approximately 60% of all vascular malformations, whereas capillary telangiectasias represent 20%, cavernomas 10%, AVMs 9%, and dural arteriovenous shunts 1% in larger autopsy series. 24,40–42 They have been seen or diagnosed in patients presenting with symptoms such as seizures, vertigo, syncope, tinnitus, 43 and headaches; however, because these symptoms are among the most often to lead to MRI investigation, a direct relationship could not be established and it is currently accepted that they represent an incidental finding in the vast majority of cases. Ellie Shoes Womens 609CHROME Platform Sandal Clear W/Silver Manchester for sale free shipping 100% guaranteed cheap official site wholesale price online brand new unisex for sale u0QoqJ

DVAs are considered as stable and benign conditions; however, as an anatomic variation, they occur in atypical locations and they may be less flexible to changes of the intracranial venous equilibrium. 2 We classified both our symptomatic DVAs and those reported in the literature according to their presumed pathomechanism and were able to divide them into 2 subsets: those caused by mechanical compression of intracranial structures (being due to an atypical location of the DVA) and those caused by a misbalance of either the in- and outflow in the DVA (therefore being related to their relative inflexibility of changes in the venous equilibrium). More than 92.7% of truly symptomatic DVAs harbored either one of these mechanisms. However, an important caveat to keep in mind is that it cannot be completely ruled out that the concurrence of a DVA with venous thrombosis within its collecting vein could be a mere coincidence because both entities represent frequent diseases/variations.

— Devin Booker (@DevinBook)

Sources: Devin Booker has signed a 5-year, $158M maximum contract extension with the Phoenix Suns.

— Shams Charania (@ShamsCharania)

The Suns see him and No. 1 draft pick Deandre Ayton as the future pillars of the organization, with Born Womens Holguin Grey Full Grain buy cheap discounts cF8q9qOCFe
and Mikal Bridges playing key roles. The Suns are investing in that future.

Booker, still 21, is a guy who can get buckets — he averaged 24.9 points per game last season, with a slightly above average 56.1 true shooting percentage and hitting 38.3 percent from three. He was slowed some last season by a series of injuries (hip, hand and others), but we know he has the off

But to live up to this max contract, Booker needs to become a better and more focused defender, plus do more as a playmaker. He’s taken steps forward as a playmaker, but he still needs a strong point guard next to him to fully take advantage of his skills. Defense has to become a bigger focus of his game.

That said, this was a no-brainer for the Suns. They had to max him out and keep him.

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By Kurt Helin Jul 7, 2018, 10:55 PM EDT

Malik Monk had a strong opening night for the Charlotte Hornets in Las Vegas — 23 points on 9-of-16 shooting, including 4-of-9 from three. He also racked up four assists and was just making plays. After a rough rookie season, it was a reminder of why the Hornets took him as a sharpshooter at No. 11 in the 2017 draft.

Then to help seal the win with three seconds left, he slapped down the ball into the floor — and apparently then fractured his right thumb, the team announced. He is done for the summer and will be re-evaluated in six to eight weeks, according to the team.

Monk is expected to have an expanded role this season in coach James Borrego’s new up-tempo offense, with the new coach calling him a “major player” in his plans. Borrego was impressed with Monk’s shooting and thinks they can use him as a primary offensive weapon for stretches. Monk will still likely come off the bench behind Nicolas Batum , but if healthy and shooting well his role will expand.

Once his thumb heals.

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By Kurt Helin Jul 7, 2018, 9:28 PM EDT

Three teams have gotten together and decided to swap problems and bad contracts. That should solve everything.

In a trade that borders somewhere between sad and inconsequential, the Bulls, Hornets, and Magic have agreed to a three-team trade, which was broken by Adrian Wojnarowski of ESPN.

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Published May 2008,February 2011.

As the sun moves across the sky, shadows change in direction and length, so a simple sundial can measure the length of a day. It was quickly noticed that the length of the day varies at different times of the year. The reasons for this difference were not discovered until after astronomers accepted the fact that the earth travels round the sun in an elliptic orbit, and that the earth's axis is tilted at about 26 degrees. This variation from a circular orbit leads to the Equation of Time (see 'Note 2' below) which allows us to work out the difference between 'clock' time and 'sundial time'.
Another discovery was that sundials had to be specially made for different latitudes because the Sun's altitude in the sky decreases at higher latitudes, producing longer shadows than at lower latitudes. Today, artists and astronomers find many ways of creating modern sundials.
An Egyptian sundial from about 1,500 BCE is the earliest evidence of the division of the day into equal parts, but the sundial was no use at night. The passage of time was extremely important for astronomers and priests who were responsible for determining the exact hour for the daily rituals and for the important religious festivals, so a water clock was invented.
When you think about the problem - we can find due South easily from the sun at midday. Looking at the night sky, we eventually deduce that there is a fixed point in the heavens around which all the stars rotate once every day (24 hours). This is where we find the 'Pole Star' (from the Great Bear or Ursa Major, measure the distance of about four lengths of the two stars at the end, 'the pointers' to find Polaris). This is the Celestial Pole - which was different for the Egyptians from today because of the phenomenon of Precession.

Up to about 1,900 BCE the Celestial Pole was Thuban a star in the 'tail' of the constellation Draco. By 1,000 BCE it was Thuban in the constellation Ursa Minor. Today Polaris is the last star in the 'tail' of Ursa Minor.

Note 2

'Sun time' and 'clock time' are different. Sun time is based on the fact that the sun reaches its highest point (the meridian), in the middle of the day, and on the next day at its highest point, it will have completed a full cycle. However, the time between the sun reaching successive meridians is often different from clock time. According to clock time, from May to August, the day is close to 24 hours, but in late October the days are about 15 minutes shorter, while in mid February the days are about 14 minutes longer. For our daily routines, it is important to have a constant 'clock time' of 24 hours. This variation is called the 'Equation of Time' and shows the relationship between sun time and clock time. The variation has two causes; the plane of the Earth's equator is inclined to the Earth's orbit around the Sun, and the orbit of the Earth around the sun is an ellipse and not a circle. The National Maritime Museum website shows two separate graphs for these causes, and a third graph where they are combined to give the full correction.

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