Fig. 3
From: Collecting duct carcinoma with retroperitoneal mass as initial presentation: a rare case report
A. At low magnification, the tumor destroys the lymph node structure and a focal residual lymphatic follicle is seen. B. The tumors are arranged in tubular or tubular papillae, and there is a large amount of inflammatory cell infiltration in the interstitium. C. The tumor on the left shows extensive necrosis. D. At high magnification, the tumor cells were columnar or cubed, with unclear boundaries, abundant cytoplasm, deeply stained nuclei, and obvious nucleoli