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The sections show multiple pieces of partly necrotic urothelium with heat artefact, diffusely infiltrated by tumour showing a variably papillary, solid and nested architecture. There is architectural disarray. Neoplastic cells show enlarged, pleomorphic and hyperchromatic nuclei and a moderate amount of cytoplasm. There are abundant mitotic figures and there is prominent apoptotic debris. Widespread invasion of lamina propria is present, and focally, tumour is seen to dissect between smooth muscle bundles, suspicious for muscularis propria involvement. Definitive lymphovascular space invasion is not seen. The specimen contained no flat urothelium for assessment of carcinoma in situ.