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Journal of Clinical Pathology 2003;56:64-68
© 2003 BMJ Publishing Group & Association of Clinical Pathologists


ORIGINAL ARTICLE

Clinical, biochemical, and immunohistochemical features of necrobiotic xanthogranulomatosis

M Jeziorska1, A Hassan1, M I Mackness1, D E Woolley1, A B Tullo3, G S Lucas2, P N Durrington1

1 Department of Medicine, University of Manchester, Manchester Royal Infirmary, Oxford Road, Manchester M13 9WL, UK
2 Department of Haematology, University of Manchester
3 Department of Ophthalmology, University of Manchester

Correspondence to:
Professor P N Durrington, University Medical Unit, Manchester Royal Infirmary, Oxford Road, Manchester M13 9WL, UK;
pdurrington{at}man.ac.uk Aims: To describe the clinical features of two patients with paraproteinaemia and necrobiotic xanthogranulomatosis together with detailed immunohistochemistry of the lesions in one.

Methods: The clinical history and results of biochemical investigations of the patients were retrieved from the files. Immunohistochemistry was used to investigate the expression of macrophage and mast cell markers, amyloid A and P, S-100 protein, and apolipoprotein AI and B in xanthogranulomatous skin lesions from patient 2. In addition, protein A–sepharose chromatography was used to separate serum from patient 2 and apolipoprotein B and the IgG paraprotein were measured in the fractions eluted.

Results: Monocytes/macrophages comprised the major cellular component of the lesion, and unusually for xanthomata, areas of collagen necrosis were also seen. Activated mast cells were present at the margins of macrophage clusters and adjacent to areas of collagen necrosis. Serum paraprotein was bound to low density lipoproteins as judged by protein A–sepharose chromatography, and was also located within macrophagic foam cells of the lesion on immunohistochemistry.

Conclusions: These observations demonstrate many features similar to atherosclerosis including collagen necrosis and mast cell activation.


Keywords: necrobiotic xanthogranulomatosis; paraprotein; low density lipoprotein; collagen necrosis

Abbreviations: apo, apolipoprotein; LDL, low density lipoprotein; HDL, high density lipoprotein; NXG, necrobiotic xanthogranulomatosis; PBS, phosphate buffered saline




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