it may not mean anything bad. this could be a spermatocele or and epididymal cyst but the fact that is causing him discomfort means that he should be seen by a pediatric urologist. hi i have had a look round for you and found this link from what i have seen this one seems to cover most and according to facts around only 4% are cancerous. the link <link> i do hope this helps you. good luck
my 12 year old was diagnosed with a testicular cyst. what does that mean? . he had an ultrasound and they found a cyst. i took him in because he was in extreme pain on the left side.