a Macroscopic findings of the cut surface of the tumoral mass showing a lobulated, firm, yellowish-white portion. b Histological findings. Hematoxylin and eosin staining showing a foreign-body granuloma consisting of string-like crystals and a foreign-body giant cell. Many tiny granulomas with central bluish-pink crystals surrounded by macrophages are evident. Bar 50 μm. c Immunohistological staining using anti-CD68 antibody (clone KP1) against CD68, a known macrophage surface marker, was positive in cells surrounding phosphoglyceride crystals (arrowhead)
bar 50 μm.