Multicentric Reticulohistiocytosis Workup
- Author: Jeffrey P Callen, MD; Chief Editor: Herbert S Diamond, MD more...
Laboratory Studies
- No specific laboratory studies are specific for multicentric reticulohistiocytosis (MRH). Rheumatoid factor findings are usually negative.
Imaging Studies
- Radiography of the affected joints reveals destruction of bone disproportionate to loss of cartilage. Lesions may resemble gouty erosions.
- Mild osteopenia is noted.
- Marked resorption of subchondral bone is common.
- The findings may develop rapidly and can resemble arthritis mutilans.
- The cutaneous nodules may be seen as soft tissue swellings.
Other Tests
- Findings on joint fluid analysis vary. The effusions may demonstrate polymorphonuclear leukocytes or mononuclear cells.
Histologic Findings
Early skin lesions demonstrate a lymphohistiocytic infiltrate. Mature lesions demonstrate a dermis filled by giant multinucleated cells with a pale, fine, granular (ie, ground glass) eosinophilic cytoplasm. Periodic acid-Schiff stain results are positive and are diastase-resistant. Lipid stain results may be positive. Results of acid phosphatase, nonspecific esterase, and lysozyme stains are usually positive. Results of S100 protein and alpha-1-antitrypsin are negative. Langerhans granules are absent on electron microscopy. In synovial biopsy, lipid-laden giant cells and histiocytes are similar to those seen on skin biopsy.
Histopathology of multicentric reticulohistiocytosis (MRH) skin lesions.
Histopathology of multicentric reticulohistiocytosis (MRH) skin lesions. Higher power demonstrating the ground glass cytoplasm and multinucleated giant cells. Goltz RW, Laymon CW. Multicentric reticulohistiocytosis of the skin and synovia; reticulohistiocytoma or ganglioneuroma. AMA Arch Derm Syphilol. Jun 1954;69(6):717-31. [Medline].
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