الفهرس 
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Abstract
Pulmonary embolism (PE) is considered a common medical condition with considerable mortality rate; it is more often to be diagnosed post-mortem by pathologists than during lifetime by physicians. Instant accurate diagnosis of acute pulmonary embolism is intractable because PE may be clinically silent in addition to nonspecific and vague clinical presentation.
Computed tomography angiography (CTA) is the diagnostic tool most commonly used in the diagnostic workup of pulmonary embolism
The aim of the study is to show the accuracy and usefulness of non-contrast CT in diagnosis of pulmonary embolism which could resemble an advantage in the emergent conditions as well as in cases with pre-existing renal disease in whom the renal function is affected or known to be allergic to contrast agents, simply, in some situations without suitable alternative.
CTPA was the method of choice, in our study, for detection of central pulmonary embolism cases of high suspicion for pulmonary embolism. Comparing it with pre contrast study enables us to identify the reliability and validity of non-contrast CT scan in detection and evaluation of pulmonary aretry embolism.
Our study revealed that positive hyper dense lumen sign can be relied upon as a predictor of PE, particularly CTPA is not possible.