The lymphocytic and histiocytic variant of Reed Sternberg cell is seen in
**Core Concept**
The **lymphocytic and histiocytic (L&H) variant of Reed-Sternberg cell** is a type of neoplastic cell seen in certain lymphomas, characterized by a distinct morphology and immunophenotypic profile. This variant is associated with a specific subtype of Hodgkin lymphoma. The L&H variant is also known as the "popcorn cell" due to its unique appearance.
**Why the Correct Answer is Right**
The L&H variant of Reed-Sternberg cell is typically seen in **nodular lymphocyte-predominant Hodgkin lymphoma (NLPHL)**, a rare subtype of Hodgkin lymphoma. This variant is characterized by a nodular or diffuse infiltrate of small lymphocytes, with the L&H cells scattered throughout. The L&H cells express **B-cell markers** such as CD20 and CD79a, and are often surrounded by a rosette of small lymphocytes.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not associated with the L&H variant of Reed-Sternberg cell.
**Option B:** Incorrect because it is a different subtype of lymphoma.
**Option C:** Incorrect because it is not a characteristic of NLPHL.
**Clinical Pearl / High-Yield Fact**
The L&H variant of Reed-Sternberg cell is a key diagnostic feature of NLPHL, and its recognition is important for distinguishing this subtype from other forms of Hodgkin lymphoma. NLPHL has a distinct clinical course and prognosis compared to other forms of Hodgkin lymphoma.
**Correct Answer:** D. Nodular lymphocyte-predominant Hodgkin lymphoma.