Plasrnacytoid lymphomas may be associated with
**Core Concept**
Plasmacytoid lymphomas, also known as hairy cell leukemia, are a rare type of cancer characterized by the proliferation of abnormal B lymphocytes. These neoplastic cells exhibit distinct morphological features, including a plasmacytoid appearance and the presence of hair-like projections on their surface.
**Why the Correct Answer is Right**
The correct answer is associated with the pathophysiology of hairy cell leukemia, which involves the overexpression of the B-cell receptor complex and the activation of various signaling pathways. The neoplastic cells in hairy cell leukemia are characterized by their high expression of CD103, CD22, and CD25, as well as their ability to internalize and recycle the B-cell receptor. This leads to a continuous activation of the cell, resulting in uncontrolled proliferation and survival.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because while some lymphomas may be associated with Epstein-Barr virus (EBV), hairy cell leukemia is not typically one of them. EBV is more commonly associated with Burkitt lymphoma, Hodgkin lymphoma, and post-transplant lymphoproliferative disorders.
**Option B:** This option is incorrect because follicular lymphoma is a different type of lymphoma that is characterized by the proliferation of B cells that express CD10 and BCL-2. While follicular lymphoma can be associated with some of the same genetic abnormalities as hairy cell leukemia, the two diseases are distinct and have different clinical and histopathological features.
**Option C:** This option is incorrect because mantle cell lymphoma is a type of B-cell lymphoma that is characterized by the overexpression of cyclin D1 due to a t(11;14) translocation. While mantle cell lymphoma can present with some similar clinical features to hairy cell leukemia, the two diseases have distinct histopathological and molecular characteristics.
**Option D:** This option is incorrect because multiple myeloma is a plasma cell malignancy that is characterized by the proliferation of neoplastic plasma cells in the bone marrow. While multiple myeloma can be associated with some similar clinical features to hairy cell leukemia, the two diseases are distinct and have different histopathological and molecular characteristics.
**Clinical Pearl / High-Yield Fact**
One key feature of hairy cell leukemia is its responsiveness to chemotherapy with pentostatin, which is a nucleoside analog that inhibits adenosine deaminase. This has led to the development of targeted therapies for hairy cell leukemia, including inhibitors of the B-cell receptor complex and the PI3K/AKT signaling pathway.
**Correct Answer: C. Mantle cell lymphoma.