Fig 3.

Low power photomicrograph (a) of the enlarged popliteal lymph node of case 1. The normal lymph node architecture has been completely effaced by sheets of epithelioid macrophages, with only scattered lymphocytes remaining. Haematoxylin and eosin (H & E) stain; scale bar=100 μm. A high power photomicrograph (b) of the same lymph node, stained using the Ziehl-Neelsen method, showing the less common scenario of enormous numbers of intracellular acid-fast bacilli (staining pink with the carbol fuchsin) in the majority of macrophages. Such multibacillary lesions were less common in our series than paucibacillary lesion. Note that the acid-fast bacilli are short, averaging 3 μm in length. Scale bar=5 μm.