Figure 2

Cytopathological examination of the tumor and regression lesion. (A) Fine needle aspiration - abundant cellularity, clusters of atypical cells without visible nucleoli, prominent nuclear molding (May-Gruenwald-Giemsa ×200, insert ×1000). (B) Immunostaining for Ber-Ep4 (×200, insert ×1000). (C) Immunohistochemical labeling of infiltrating lymphocytes showed a dense infiltrate of CD3+ cells (pan-T cell) (×400). (D) Immunohistochemical labeling showed a dense infiltrate of CD68+ cells (monocytes/macrophages) (×400).