EBV positivity is higher in which type of Hodgkin lymphoma:
### **Core Concept**
Epstein-Barr virus (EBV) positivity is a significant feature in certain subtypes of Hodgkin lymphoma, reflecting the virus's role in lymphomagenesis. EBV can be detected in the Reed-Sternberg cells of Hodgkin lymphoma, and its presence is associated with distinct clinicopathological characteristics.
### **Why the Correct Answer is Right**
Mixed cellularity Hodgkin lymphoma (MHCL) is characterized by a mix of lymphocytes, histiocytes, and Reed-Sternberg cells in a background of fibrosis. The presence of EBV in MHCL is higher compared to other subtypes, such as nodular sclerosis Hodgkin lymphoma (NSHL). This is because EBV-infected B cells are more likely to undergo malignant transformation in the context of mixed cellularity, leading to the development of Reed-Sternberg cells. The EBV latency III program, which involves the expression of Epstein-Barr nuclear antigen 2 (EBNA2) and latent membrane protein 1 (LMP1), is particularly prevalent in MHCL.
### **Why Each Wrong Option is Incorrect**
**Option A:** Nodular sclerosis Hodgkin lymphoma is characterized by the presence of lacunar cells and a distinct nodular pattern, but EBV positivity is lower compared to mixed cellularity Hodgkin lymphoma.
**Option C:** Lymphocyte-depleted Hodgkin lymphoma is a rare and aggressive subtype, often associated with a high number of Reed-Sternberg cells and a poor prognosis. However, EBV positivity is not as high as in mixed cellularity Hodgkin lymphoma.
**Option D:** Lymphocyte-rich Hodgkin lymphoma is characterized by a high number of lymphocytes and a paucity of Reed-Sternberg cells. While EBV can be detected in some cases, the overall prevalence is lower compared to mixed cellularity Hodgkin lymphoma.
### **Clinical Pearl / High-Yield Fact**
The presence of EBV in Hodgkin lymphoma is associated with a worse prognosis, particularly in mixed cellularity and lymphocyte-depleted subtypes. This highlights the importance of EBV testing in the diagnosis and risk stratification of Hodgkin lymphoma.
### **Correct Answer Line**
✓ Correct Answer: B. Mixed cellularity.