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ULTRASTRUCTURAL FEATURES
Dense bodies (top figure; green arrows)
Basal lamina (top figure; brown arrows)
Intermediate filaments
Tonofilaments
Desmosomes
Microfilaments (bottom figure; arrow)
Myxoid stroma
Amorphous hyaline material
IMMUNOHISTOCHEMICAL FEATURES
Cytokeratin 14, variable
Vimentin, variable
Smooth muscle actin, variable
- Spindle cells, strongly
- Epitheliod cells, rarely
- Plasmacytoid cells, non-reactive
Desmin absent
S-100, rare
GFAP, rare
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Slide 34
