Primitive Neuroectodermal Tumor
Section Editor: Dharam M. Ramnani, MD
Virginia Urology, Richmond, VA, USA
Image Description
High power view showing sheets of primitive appearing round tumor cells with scant cytoplasm and high N:C ratio. Mitotic activity is usually brisk. Necrosis and vascular invasion are also prominent features. The main differential diagnosis is blastema-predominant Wilms tumor.