Fig. 6

Pathological findings for both of the lung metastases. a Whole microscopic view showing nodular and cystic tumors in the resected right lung. b Tumor showing papillary, tubular, or lepidic proliferation of atypical columnar cells. Immunohistochemistry findings for the right lung specimen for c MUC1, d MUC2, e MUC5AC, f MUC6, and g TTF-1. h Whole microscopic view showing nodular and cystic tumors in the resected left lung. A small daughter lesion near the main tumor was also noted in the left lung (white arrow). i Tumor showing papillary, tubular, or lepidic proliferation of atypical columnar cells. Immunohistochemistry findings for the left lung specimen for j MUC1, k MUC2, l MUC5AC, m MUC6, and n TTF-1