Fig. 1

Photomicrographs of hyaline ring granulomas. a Small lesions disseminated in the omental adipose tissue. HE, bar 200 μm. b Corrugated, eosinophilic structures (hyaline rings) associated with inflammatory cell infiltrate entrapment within the rings. HE, bar 20 μm. c Presence of foreign material, most likely of plant origin, surrounded by hyaline rings (arrows) and chronic granulomatous inflammation with multinucleated foreign-body type giant cells reaction (arrowheads). HE, bar 20 μm. d Plant internal structure characterized by the presence of thin-walled cells forming a honeycomb structure suggestive of phloem, and tubular structures resembling tracheids in the xylem with the appearance of microscopic coils (thin arrows). Implanted plant particles are associated with hyaline rings (arrow) and multinucleated giant cell (arrowhead). HE, bar 20 μm