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Low power photomicrograph (a) of an enlarged lymph node from case 8. Lymph node architecture has been partially effaced by sheets of epithelioid macrophages. Only a remnant of the normal cortical histological architecture remains. H & E stain; scale bar=100 μm. Higher power Ziehl-Neelsen stained section (b) of the same lymph node showing the more common paucibacillary reaction pattern; only one acid-fast bacillus (stained red, just left of centre) can be seen; scale, bar=10 μm.
