الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Although penis is superficial organ and most of its parts can be examined clinically and palpation can supply us with data for diagnosis, imaging modalities are helpful in some cases to confirm clinical diagnosis or determine extent and degree of pathophysiologic changes in penile disorders. Thus, imaging modalities as US, CDUS and MRI represent the most familiar imaging technique that give clear delineation for anatomical and pathologic details in penis. Sonography is easy to perform, painless, non invasive, easily repeatable, and has no negative side effects. MRI is still expensive and not widely available. Therefore, it is not suitable for all cases. It should not be used routinely. Only few conditions in which MRI is a useful problem-solving tool as in priapism, penile fracture, and penile fibrosis. In erectile dysfunction, CDUS represents an excellent and highly accurate method in evaluation of organic causes of impotence, as the majority of these causes are vasculogenic in origin; hence, comes the importance of such imaging modality that clearly visualizes penile vessels and can delineate with high degree of accuracy, the part affected when vasculogenic etiology dominates. Grey scale US can depict structural changes in penile corpora as fibrosis, plaques, calcifications and many pathologic changes that interfere with one or more of steps of the mechanism of erection. Being non invasive technique propose that it should replace angiography and cavernosometry as a golden standard method in erectile dysfunction.