Thank you for your medical query at AskTheDoctor.com
I understand your concern.
In most cases, the heterogenous mass is present in cases of seminoma or the germ cell tumor that arises from the testes.
I will advise you to talk to a urologist who can also physically examine in you person, and if required perform a biopsy on the lesion. The size is still very small, hence, there is a possibility it can be from previous infections or hydrocele.
Heterogeneity in most cases indicate that the mass is filled with different types of cells, and that's what raises the suspicion of cancer. So, please talk to an urologist and most probably a biopsy will be suggested for further evaluation.
Hope this was helpful,
Feel free to discuss further,
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