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*Mucin (foamy macrophages) - may be scant. | *Mucin (foamy macrophages) - may be scant. | ||
*Spindle cells - '''key feature'''. | *Spindle cells - '''key feature'''. | ||
**Often seen only focally. | |||
*Small tubules - lined by cuboidal epithelium.<ref name=pmid24330589/> | *Small tubules - lined by cuboidal epithelium.<ref name=pmid24330589/> | ||
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