16th February 2024

A 78-year-old male presents with a penile lesion.

A 78-year-old male presents with a penile lesion. The lesion is situated on the glans of the penis. This has a central ulceration with irregular borders and has grown in size over the past four weeks. A biopsy of the lesion reveals squamous cell carcinoma. Lymphadenopathy is noted on CT imaging. 

Which of the following lymph node groups would have been affected first in the event of metastasis?