Please help! What is the connection between solitary plasma and testis?

Here are some... Assumed your concern being plasma cell tumors, it is extremely rare as the initial site of this malignancy, i.e., primary; in fact, if happening, it is usually as secondary site from systemic diseases like multiple myeloma, leukemia, etc. In practice, it is a good idea to keep this in mind, but having a palpable lump in doubt inside sac be professionally checked is the right thing to do. Best...