What special stains can be done on the cytocentrifuge preparation to help establish the diagnosis?
- • Wright stain.
- Lupus erythematosus cell: PMNs with ingested homogeneous nuclear material.
- Reiter’s cell: large macrophage with ingested PMNs (cytophagocytic mononuclear cells).
- Hydroxyapatite crystals in PMNs.
- Charcot–Leyden crystals in eosinophils.
- • Alizarin Red S: stains calcium crystals (hydroxyapatite and CPPD).
- • Oil Red O/Sudan Black: stains for fat globules.
- • Congo Red: stains amyloid fragments.
