Figure 1: Histology and histochemistry of lung biopsy: A. H&E of one of the six biopsies showing relatively well preserved alveoli. B and C peripheral lung showing a giant cell, poorly formed granulomas and lymphohistiocytic infiltrate. D. Immature fibrous tissue in the interstitium and alveoli. Immunohistochemistry using anti-CD3, (E) or anti-CD68, (F) monoclonal antibodies showing abundant presence of T cells and macrophages respectively.