From: | Richard Cartun <Rcartun@harthosp.org> |
We have an interesting lesion near the serosal surface in a section of small bowel composed of "signet-ring" -like cells that show immunoreactivity (both nuclear and cytoplasmic) for calretinin. These same cells are cytokeratin-7 negative; therefore, they are not mesothelial cells. Any ideas on their lineage? R. Cartun