Autoimmune hemolytic anemia is associated with malignancy of which cell lineage?
**Core Concept**
Autoimmune hemolytic anemia (AIHA) is a condition where the immune system produces antibodies against the red blood cells, leading to their destruction. This can be associated with various underlying conditions, including malignancies. The **lymphoid cell lineage** is particularly relevant in the context of AIHA.
**Why the Correct Answer is Right**
The correct answer is associated with chronic lymphocytic leukemia (CLL), a malignancy of **B lymphocytes**. CLL is known to be associated with AIHA due to the production of autoantibodies against red blood cell antigens. The **CD20 positive B cells** in CLL can produce these autoantibodies, leading to hemolysis.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because while other malignancies can be associated with AIHA, they are not as directly linked as CLL.
**Option B:** Incorrect as it is not specifically related to the common association with AIHA.
**Option C:** Incorrect because it is not the cell lineage most commonly associated with AIHA in the context of malignancy.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that AIHA can be a presenting feature or a complication of CLL, highlighting the importance of investigating for underlying malignancy in patients with AIHA, especially those with a **lymphoproliferative disorder**.
**Correct Answer:** D. B cell lineage