Fig. 2From: A surgical case of eosinophilic angiocentric fibrosis of the lungPathological analysis showed a a dense bronchocentric inflammatory infiltrate with numerous inflammatory cells and perivascular fibrosis. b Fibro-inflammatory lesion (perivascular fibrosis) surrounding the vessel in a whorled pattern. Numerous eosinophils infiltrate the lesion. c A fibrotic nodule with the “onion-skin” fibrosis pattern that is pathognomonic for eosinophilic angiocentric fibrosis. d Immunohistochemical staining for IgG4 revealed a large number of IgG4-positive cells (400 cells per high-power field)Back to article page