Figure 4a. Histologic features of plexiform neurofibroma. (a) Photomicrograph (original magnification, x10; hematoxylin-eosin [H-E] stain) shows the fascicular arrangement of the tumor. Some fascicles are mucin rich (arrow). (b) Photomicrograph at higher magnification (original magnification, x16; H-E stain) shows dense, spindle-shaped curved nuclei mixed with eosinophilic collagen and basophilic myxoid matrix.