- Formerly
called plasmacytoid monocytes
- Location:
paracortex, in clusters
- Morphology:
- Clusters,
with tingible-body macrophages but no mantle zone
- Medium size,
round cell, well-defined cell borders
- Cytoplasm:
moderate, eosinophilic to faintly basophilic
- Nucleus:
round, oval or slightly indented, fine or vesicular chromatin
- Nucleolus:
1-2, small
- Frequent
apoptosis and tingible-body macrophages
- CD123+,
CD68+, lysozyme+, CD11c-
- DDX:
- Reactive
germinal center: CD21+ meshwork, mantle zone, a diversity of
cells
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