A Diagnostic Surprise of Thymoma Type B1 – Case Report

Abstract

In the anterior mediastinum, thymoma is the most common tumor followed by lymphoma being the second most common with subtypes being hodgkin’s lymphoma, diffuse large B-cell lymphoma and lymphoblastic lymphoma. Since thymomas are of lymphoepithelial organ and consist of thymocytes and epithelial cells, the differential diagnosis of thymoma against lymphoma is challenging. Differentiating lymphoma from a thymoma is important for treatment regimes.

Here, we discuss a case of a 37 year old with an anterior mediastinal mass who was diagnosed as having Non- hodgkin’s lymphoma radiologically and also in FNAC but surprisingly turned out to be Thymoma Type- B1 after histopathological analysis by immunohistochemistry that differentiated it from Non- Hodgkin’s lymphoma.