Figure 2 (A,B) Histological findings of the primary tumour. (A) Admixture of glands and highly cellular stroma. (B) Cribriform glands were sporadically observed. The secretory cells have uniformly enlarged nuclei and inconspicuous nucleoli, with a lining of single‐layered basal cells (arrowheads). (C,D) Histological findings of the recurrent tumour. (C) Admixture of glands and cellular stroma; the former is predominant and cribriform glands were frequently observed. (D) The secretory cells are densely stratified and have prominent nucleoli, with a lining of single‐layered basal cells (arrowheads). (E,F) Immunostaining in the recurrent tumour. (E) More Ki‐67 immunoreactive nuclei are observed in the epithelia than in the stroma. (F) Immunostaining for high‐molecular‐weight cytokeratin demonstrates a partly discontinuous pattern of basal cell reactivity (arrowheads).