Figure 3: (a) section showing multiple fragments of tumour tissue arranged in villiform finger-like projections with central fibrovascular cores (H&E, 12.5x); (b) an enlarged rectangular area of 3a showing that these villi were lined by pseudostratified columnar epithelium, featuring elongated, hyperchromatic nuclei with preserved cellular polarity and apical mucin. Adjacent tissue was lined by benign stratified columnar urothelium exhibiting 5 to 7 layers of urothelial cells with overlying umbrella cells (H&E, 100x)