Histological evaluation of resected lymph nodes revealed lipogranulomas and clusters of epithelioid macrophages with inclusions that were positive with the periodic acid-Schiff (PAS) stain (Figure 2).

Our experience shows that PAS staining has a lower sensitivity than that of specific immunohistochemical staining with anti-T. whipplei polyclonal rabbit antibodies. 8 We have also found that the ...