The section was stained lighter than usual. Medium power view of the upper left part of the mass depicted above. The mass has a scalloped outline in this area. Tissue mucin is present but not prominent in this preparation. High power view of above.
Spindle cells having eosinophilic cytoplasm resemble ordinary smooth muscle cells.
The tumor has more of a fascicular pattern in this area, and there is an interesting structure in the lower right part of the picture. Tissue mucin is prominent in this preparation. High power view of the interesting structure. This type of structure has been interpreted as 'vascular invasion' but this is not indicative of malignancy in this setting. This area has features that can be seen in a pericytoma.