Editing Priapism (section)

===Ultrasonography===
[[File:Ultrasonography of traumatic arteriovenous fistula of the penis.jpg|thumb|Color Doppler ultrasound demonstrating a hypoechoic collection that corresponds to hematoma with arteriovenous fistula secondary to traumatic injury of the penis due to impact with bicycle handlebars, resulting in high-flow priapism<ref name="FernandesSouza2018"/>]]
[[Penile ultrasonography]] with [[Doppler ultrasonography|Doppler]] is the imaging method of choice, because it is noninvasive, widely available, and highly sensitive. By means of this method, it is possible to diagnose priapism and differentiate between its low- and high-flow forms.<ref name="FernandesSouza2018">Originally copied from:<br />{{cite journal|last1=Fernandes|first1=Maitê Aline Vieira|last2=Souza|first2=Luis Ronan Marquez Ferreira de|last3=Cartafina|first3=Luciano Pousa|title=Ultrasound evaluation of the penis|journal=Radiologia Brasileira|volume=51|issue=4|year=2018|pages=257–261|issn=1678-7099|doi=10.1590/0100-3984.2016.0152|pmc=6124582|pmid=30202130}}<br />[[Creative Commons|CC-BY]] license</ref>

In low-flow (ischemic) priapism the flow in the cavernous arteries is reduced or absent. As the condition progresses, there is an increase in echogenicity of the corpora cavernosa, attributed to tissue edema. Eventually, changes in the echotexture of the corpora cavernosa can be observed due to the fibrotic transformation generated by tissue anoxia.<ref name="FernandesSouza2018"/>

In high-flow priapism normal or increased, turbulent blood flow in the cavernous arteries is seen. The area surrounding the fistula presents a hypoechoic, irregular lesion in the cavernous tissue.<ref name="FernandesSouza2018"/>