A 35-year-old male patient recently noticed a nodular growth on the right testicle. He reports a feeling of pain and heaviness in the testicle. Physical examination reveals a smooth, firm nodule of 5 to 6 cm on the right testicle. The right scrotum is erythematous, and inguinal lymph nodes are palpable. The clinician should order a(n) ____ to evaluate this finding.