Rgr rgr. From how you said it, thought you meant in humans. I'm not a rat anatomist but it appears the equivalent is a Scrotal Hernia if I read correctly. A potentially interesting area of investigation that merits follow up. An interesting write up with more background. Apparently, as with so many discoveries, found during a different investigation:
http://www.news-medical.net/news/201...older-men.aspx
Source study:
https://plan.core-apps.com/tristar_e...a03154444733b4
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