Figure 1.

Histological features. A: Diffuse atypical lymphoid cell proliferation is seen. HE, ×100. B: The atypical cells are small lymphoid cells with hyperchromatic nuclei. Lymphoepithelial lesions are seen. HE, × 400. C: The lymphoepithelial lesions are clearly accentuated by cytokeratin immunostaining. AE1/3 immunostaining, ×200.