Is a spermatocele located inside or outside epididymist? can it be located anywhere along the epididymis? is testicular cancer located the same place?

In the epididymus: Thus, it is outside the testicle itself which is where testicular cancer is found. http://www.mayoclinic.com/health/spermatocele/ds00619.

Inside epididymis: A spermatocele is a sac (cyst) that develops inside the epididymis. Unless large and cause some discomfort, it is typically painless and noncancerous. It usually is filled with milky or clear fluid that may contain sperm. Testicular cancer is located inside the testicle which is different from the epididymis.