A Solitary Malignant Schwannoma in the Choana and Nasal Septum
Figure 2
Histopathological findings of hematoxylin and eosin staining ((a), (b)) and immunohistochemical staining ((c)–(f)). (a) A vaguely whorled growth pattern with large and multilobulated nuclei, resembling a palisade (×200). (b) The individual neoplastic cells have finger-like projections of cytoplasm and atypical multilobulated nuclei with irregular nuclear membranes (×400). (c) Brown-colored cells are positive for S-100 protein (×400). (d) Ki-67-positive cells show brown-colored nuclear staining (×200). (e) Ubiquitous intermediate filaments of vimentin are positively expressed as brown color (×400). (f) Brown-colored cells are positive for CD56 (×100).
