Histologic, immunohistochemical and ultrastructural results of a rhino
scleroma diagnosed bioptically on a 38 aged man are demonstrated. The
characteristic light microscopic sign is a plasmocytic inflammatory in
filtrate with dense packed foamy transformed macrophages (Mikulicz cel
ls) ultrastructurally containing diplobacilli (Klebsiella rhinosclerom
atis, gram negative agent of the lesion). The lesion has to be differe
ntiated as of other inflammatory diseases as of plasmocytoma. A local
application of acriflavin solution 2% was of therapeutical benefit.