A 32-year-old man presents with a painless scrotal mass that has been gradually increasing in size over the past 2 months. On examination, the mass is firm, non-tender, and localized to the left testis. An ultrasound confirms the presence of a solid intratesticular mass, and serum tumor markers are elevated. The physician orders imaging to assess lymph node involvement. Which of the following lymph nodes are most likely to be involved if this testicular mass is malignant?
