bb size lump

  I recently found a hard bb like mass at top of left testicle, right at joining of epiditymis.  feels more like on surface of testicle. had an ultrasound that showed nothing. Urologist told me I had a calcium like deposit that is in the fluid around teste. If that's the case, why does it feel like it is connected?  If it is in fluid, should it feel connected to the teste? It can only be felt with pressure on teste, not by squeezing epiditymis.  I don't want to be a worry wart, but I don't understand how it can be free floating in fluid, but feel connected like it is growing out of teste.
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Dear Scott
Thanks for your question.
I can not vouch for your physician