A 22-year-old male presents with a left scrotal mass. He sustained mild trauma to the left hemiscrotum five weeks ago while playing basketball. The trauma prompted him to palpate his left testicle and he noted a left testicular mass. The patient states that he had mild pain initially that spontaneously resolved and denies any swelling. He says the mass has remained stable in size, like a large almond, and is located “in the middle” of the left testis. He denies subjective fevers, chills, dysuria, gross hematuria, or urethral discharge. Physical examination reveals a firm 2-cm mass within the left testis. There is no pain to palpation. There are no epididymal masses bilaterally, and the right testis is unremarkable. Abdominal exam reveals no masses and no hepatomegaly. There are no supraclavicular nodes and no gynecomastia. Laboratory analysis reveals a normal urinalysis and complete blood count.