A 25-year-old man presents to the clinic with a painless lum…
A 25-year-old man presents to the clinic with a painless lump in his neck that he first noticed three months ago. He reports occasional night sweats and unintentional weight loss of 10 pounds over the past few months. He denies fever, recent infections, or tenderness in the lump. A lymph node biopsy is performed and reveals a malignant proliferation of lymphoid cells. Which of the following is the most common site where Hodgkin lymphomas typically arise?