AMCcommon
A 27-year-old woman has painless enlargement of the left side of her neck and drenching night sweats. She has no sore throat, dental symptoms or recent travel. CT shows cervical and mediastinal lymphadenopathy without extranodal disease. An excised node contains scattered large cells with bilobed nuclei in a background rich in small lymphocytes and eosinophils; the large cells express CD30 and CD15. Which one of the following is the most likely diagnosis?