A person is having painless lymphadenopathy. On biopsy, binucleated owl shaped nuclei with clear vacuolated area is seen. On IHC CD 15 and CD 30 were positive. What is the most probable diagnosis?
**Core Concept**
The question is testing the identification of a specific subtype of Hodgkin lymphoma (HL) based on histopathological and immunohistochemical features. The presence of binucleated, owl-shaped nuclei with clear vacuolated areas is a characteristic finding in a particular subtype of HL.
**Why the Correct Answer is Right**
The described histological features are consistent with the diagnosis of classical Hodgkin lymphoma (cHL), specifically the nodular sclerosis subtype. The "owl-eyed" appearance is due to the presence of a large, clear cytoplasmic area surrounding the nuclei, giving the cell a distinctive appearance. The positivity for CD15 and CD30 on immunohistochemistry is also characteristic of cHL. These markers are expressed on the Reed-Sternberg cells, which are the hallmark of HL. In nodular sclerosis, the tumor cells are often found in a background of fibrotic bands and lymphoid infiltrate, giving a characteristic nodular appearance.
**Why Each Wrong Option is Incorrect**
**Option A is incorrect** because while nodular sclerosis is indeed a subtype of HL, the description provided is not specific enough to rule out other subtypes. However, the presence of CD15 and CD30 positivity, combined with the histological features, makes nodular sclerosis the most likely diagnosis.
**Option B is incorrect** because large granular lymphocytic lymphoma is a type of non-Hodgkin lymphoma (NHL) characterized by the presence of large granular lymphocytes, which do not match the description provided.
**Option C is incorrect** because lymphocyte depletion type is a rare subtype of HL characterized by a paucity of lymphocytes in the background, which does not match the description provided.
**Option D is incorrect** because lymphocyte-predominant Hodgkin lymphoma (LPHL) is a distinct subtype of HL that typically presents with lymphocytic and histiocytic (L&H) cells, also known as "popcorn cells." The description provided does not match LPHL.
**Clinical Pearl / High-Yield Fact**
When encountering a case of Hodgkin lymphoma, it is essential to perform immunohistochemical staining to identify the presence of CD15 and CD30 on Reed-Sternberg cells. This can help differentiate cHL from other types of lymphoma and guide further management.
**✓ Correct Answer: A. Nodular sclerosis**