 [ Symptoms ] 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 [ Disease ] 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