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Low power reconstruction of the renal lesion with fungiform surface component and expansile cortical component showing prominent hyperplastic squamous epithelium.
High power showing well developed squamous differentiation (sometimes incorrectly referred to as 'squamous metaplasia' - this term should be reserved for non-neoplastic reactive changes occurring in benign epithelium.
High power showing poorly differentiated urothelial carcinoma component with poorly formed nests and single infiltrating tumour cells with an associated mixed inflammatory infiltrate.