CCTA is able to detect narrowing of blood vessels in time for corrective therapy to be done. CCTA is a useful way of screening for arterial disease because it is safer, much less time-consuming than catheter angiography, and is also a cost-effective procedure. CTA can be used in the chest and abdomen to identify aneurysms in the aorta or other major blood vessels. These areas of weakened blood vessel walls that bulge out can life-threatening if they rupture. CTA is the test of choice when assessing aneurysm before and after endovascular stenting due to the ability to detect calcium within the wall. Another positive of CTA in abdominal aortic aneurysm assessment is it allows for better estimation of blood vessel dilation and can better detect blood clots as compared to standard angiography. CTA is used also to identify arterial dissection, including aortic dissection in the aorta or its major branches. Arterial dissection is when the layers of the artery wall peel away from each other; this causes pain and can be life-threatening. CTA is a quick and non-invasive method of identifying dissections and can show the extent of the disease and if there is leakage. CT pulmonary angiogram (CTPA) is used to examine the pulmonary arteries in the lungs, most commonly to rule out pulmonary embolism (PE), a serious but treatable condition. It has become the technique of choice for detection of pulmonary embolism due to its wide availability, short exam time, ability to see other diseases that may present like pulmonary embolisms, and a high degree of confidence in the validity of the test. In this test, a PE will appear as a dark spot inside the blood vessel or a sudden stop of the bright contrast material. CT angiography should not be used to evaluate for pulmonary embolism when other tests indicate that there is a low probability of a person having this condition. Dzahui  In Mixtec mythology, Dzahui or Dzavui was the god of rain. Child sacrifices were performed for Dzahui on the tops of hills during times of drought, sickness, and at harvest time. In Mixtec codices, Dzahui exhibits the blue or green rain goggle mask also seen on the central Mexican deity Tlaloc. He possesses exposed teeth incisors and longer, somewhat curled jaguar canine teeth emerging from curled lips.