Four patients with priapism - 3 with idiopathic and 1 with post-traumatic etiologies - were examined by arteriography and cavernosography. The findings of these examinations as well as distinct clinical findings suggest that there are 2 different types of priapism. One is characterized by severe blood stasis within the corpora cavernosa with resulting compression of the deep arteries of the penis and reduction of arterial blood flow. In the other type, arterial flow into the corpora cavernosa and drainage into the veins are substantially increased. In this type, long-standing priapism does not seem to produce fibrosis of the corpora cavernosa with resulting impotence.
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