Epididymis

You could be describing an enlarged epididymis, or a retention of fluid in one of the many spaces it could occupy. You describe it as like a 3rd testicle, which could be a tumor, but then say it's not like a testicle. There is a long list of ...

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... - cervix - vagina - (vulva) http://www.irishhealth.com/content/image/550/Image1.jpg --- Male route: Testis - ductus efferentes - epididymis - vas defferens - (ampulla, ductus ejaculatorius) - penile urethra Glands: vesicula seminalis, bulbourethral glands, prostate glands, etc. ...

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