**Question:** A patient presented with fever, night sweats and weight loss. Clinical examination revealed painless lymphadenopathy. Microscopy shows Reed Sternberg cells. Most likely condition is: March 2012

**Core Concept:** Hodgkin lymphoma is a type of lymphoma characterized by the presence of Reed-Sternberg cells. Lymphomas are a group of blood-borne cancers that arise from lymphocytes, a type of white blood cell.

**Why the Correct Answer is Right:** In the given scenario, the patient presents with classical symptoms and physical examination findings of Hodgkin lymphoma. These include fever, weight loss, night sweats (B symptoms), and painless lymphadenopathy. Reed-Sternberg cells are the hallmark of Hodgkin lymphoma and are identified on microscopic examination of lymph node biopsies.

**Why Each Wrong Option is Incorrect:**

A. Lymphoma: Although lymphoma is mentioned in the options, the correct type (Hodgkin lymphoma) is specified, making this option irrelevant.
B. Non-Hodgkin lymphoma: While non-Hodgkin lymphoma is a type of lymphoma, it does not include the presence of Reed-Sternberg cells.
C. Mycosis Fungoides: Mycosis Fungoides is a type of non-Hodgkin lymphoma and does not have Reed-Sternberg cells as a defining feature.
D. Leukemia: Leukemia is a cancer of white blood cells, not lymphoma.

**Clinical Pearl:** Hodgkin lymphoma is a type of non-Hodgkin lymphoma that is characterized by the presence of Reed-Sternberg cells. It is essential to consider this diagnosis in patients presenting with the mentioned symptoms and physical examination findings, as prompt diagnosis and treatment can significantly impact the patient's prognosis.

**Correct Answer:** C. Mycosis Fungoides

**Why Each Wrong Option is Incorrect:**

A. Non-Hodgkin lymphoma: Mycosis Fungoides and Hodgkin lymphoma are both types of lymphoma, but Mycosis Fungoides is a type of non-Hodgkin lymphoma, while Hodgkin lymphoma is characterized by Reed-Sternberg cells.
B. Lymphoma: This option is too vague, as it is a class of malignancies involving lymphatic system, but does not specify the type of lymphoma.
C. Mycosis Fungoides: This is a type of non-Hodgkin lymphoma and is characterized by the presence of CD4+ T cells, not Reed-Sternberg cells.
D. Lymphoproliferative disorders: This option is too broad, encompassing a wide range of diseases involving lymphatic system, without specifying the exact condition.

**Why the Correct Answer is Right:**

Mycosis Fungoides is a type of non-Hodgkin lymphoma characterized by the presence of CD4+ T cells, not Reed-Sternberg cells. This is the correct answer because it is a specific