Diagnosis

To diagnose a spermatocele, you'll need a physical exam. Although a spermatocele generally isn't painful, you might feel discomfort when your doctor examines (palpates) the mass.

You might also undergo the following diagnostic tests:

• Transillumination. Your doctor might shine a light through your scrotum. With a spermatocele, the light will indicate that the mass is fluid-filled rather than solid.
• Ultrasound. If transillumination doesn't clearly indicate a cyst, an ultrasound can help determine what else it might be. This test, which uses high-frequency sound waves to create images of structures, might be used to rule out a testicular tumor or other cause of scrotal swelling.