There is no pleomorphic, limited mitoses, and no necrosis. Histologically, they have a papillary architecture with slender fibrovascular cores and rare basal mitoses. There is usually no hemorrhage, necrosis or increased mitoses. Tumor cells are very pleomorphic (anaplastic), some are giant, numerous atypical mitoses. The nuclei are uniform, blunt-ended and cigar-shaped with only occasional mitoses. Nuclear pleomorphism is usually minimal and mitoses are infrequently seen. They typically have few mitoses and lack necrosis. These cells are uniform in size and shape, with scarce mitoses. The mitoses must be counted in an area of the highest mitotic activity. Mitoses are uncommon when compared to basal cell carcinoma.