A 29 year-old white male comes to your office for the evaluation of a ‘hydrocele’. He is a cross-country runner and for the last 4 months he has been feeling a lump in his left testis. He states, ‘It does not hurt much, but it is annoying while running. Some fluid built up quickly in the left testis over the last two days’. He reports a history of cryptorchidism treated with surgery. He is not sexually active. On review of systems, he informs that he has some back pain and occasional cough. On physical examination, you feel a normal epididymis and a painless, firm, discrete nodule in the left testis. What is the next step in the management of this patient?
