At low power (A, 10×), the nested subtype of urothelial carcinoma is characterized by crowded nests with deceptively bland appearance, irregularly invading muscle fibers. At higher power (B, 20×) the cytologic atypia increases, particularly in the deeper portion of the lesion.
Courtesy of Cristina Magi-Galluzzi, MD, PhD.
Graphic 62076 Version 2.0
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