Fig. 2

a The biopsy specimen from the lung showed noncaseating granuloma with accumulation of epithelioid cells (white arrow). b Immunohistological staining of the biopsy specimen revealed the presence of CD68-positive cells, which represented epithelioid cells (black arrow). c The resected spleen had diffusely scattered noncaseating epithelioid granulomas (white arrow). d CD68-positive cells were observed in the scattered granuloma region (black arrow). e Foamy cells infiltrating the interstitial wall were observed around the respiratory bronchiole (black arrowhead)