Sinonasal Schwannoma with New Bone Formation Expressing Bone Morphogenic Protein

Figure 4

Immunohistochemistry for bone morphogenic protein (BMP; x100 magnification). (a) BMP-2, (b) BMP-4, and (c) BMP-7. The tumor cells stained positive for BMP-4 and negative for BMP-2 and BMP-7. *asterisk: bone tissue.

(a)

(b)

(c)