Diagnosis: Invasive urothelial carcinoma with inverted growth pattern, grade 2 (high-grade), stage pT1.     

            Comment: The cytological features in this particular case are not consistent with inverted papilloma. Hyperchromatism, pleomorphism, and mitoses favor urothelial carcinoma. Additionally, there is focal invasion of the stroma (stage pT1) as seen  in Figs. 4 and 5.