« Male Genitals - Prostate Neoplasms » [archive du ], Pathology study images, University of Virginia School of Medicine (consulté le ) : « There are many connections between the prostatic venous plexus and the vertebral veins. The veins forming the prostatic plexus do not contain valves and it is thought that straining to urinate causes prostatic venous blood to flow in a reverse direction and enter the vertebral veins carrying malignant cells to the vertebral column. »
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« Male Genitals - Prostate Neoplasms » [archive du ], Pathology study images, University of Virginia School of Medicine (consulté le ) : « There are many connections between the prostatic venous plexus and the vertebral veins. The veins forming the prostatic plexus do not contain valves and it is thought that straining to urinate causes prostatic venous blood to flow in a reverse direction and enter the vertebral veins carrying malignant cells to the vertebral column. »
