Which of the following is the best marker to distinguish Thymoma from lymphoma?: (A) CD19, (B) Cytokeratin, (C) CD79a, (D) Laminin
Answer is B. Both thymoma and Lymphoma are common mediastinal tumors. But Thymoma has both Lymphocytic & Epithelial Component. Hence "Cytokeratin" which is a epithelial cell marker is best to distinguish it from Lymphoma.