Sinonasal Schwannoma with New Bone Formation Expressing Bone Morphogenic Protein
Figure 3
Macroscopic (a) and microscopic (x100 magnification) (b) features of the excised tumor. The spindle cells are arranged in a patternless fashion, and new bone formation consisting of randomly organized trabeculae lined by osteoblasts was observed in the tumor. black arrows and *asterisk: bone tissue.
