Classification

 Erdheim-Chester disease
 systemic xanthohistiocytoma
 xanthoma disseminatum
 systemic juvenile xanthogranuloma
 sinus histiocytosis with massive lymphadenopathy (Rosai-Dorfman disease)
 generalized eruptive histiocytosis

Immunochemistry

 MS-1 positive (MS-1+)

References

 Weitzman S, Jaffe R. Uncommon histiocytic disorders: the non-Langerhans cell histiocytoses. Pediatr Blood Cancer. 2005 Sep;45(3):256-64. PMID: #15547923#

 Jaffe R. The other histiocytosis. Pediatr Dev Pathol. 2004 Jan-Feb;7(1):2-4. PMID: #15255029#

 Zelger BW, Sidoroff A, Orchard G, Cerio R. Non-Langerhans cell histiocytoses. A new unifying concept. Am J Dermatopathol. 1996 Oct;18(5):490-504. PMID: #8902096#