Transverse ultrasound of the penis, in a ventral view, in the middle portion of the penis. Note the echoic image with posterior acoustic shadowing, corresponding to calcification (arrow), in the left corpus cavernosum. | Maitê Aline Vieira Fernandes, Luis Ronan Marquez, Ferreira de Souza and Luciano Pousa Cartafina3 – (2018). “Ultrasound evaluation of the penis”. Radiologia Brasileira 51 (4): 257–261. DOI:10.1590/0100-3984.2016.0152. ISSN 1678-7099.CC-BY license, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=77309497

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