Abstract
1. The clinical, radiological and pathological features of 106 cases of eosinophilic granuloma of bone (solitary and multiple) are reported.
2. Our findings support strongly the concept that eosinophilic granuloma, Hand-Schüller-Christian and Letterer-Siwe syndrome are closely related manifestations of a single pathological disorder, characterised fundamentally by the proliferation of non-neoplastic histiocytes, intermingled with a variable amount of eosinophilic leucocytes and other inflammatory elements.
3. Lipid-bearing histiocytes (xanthoma cells) may be found in variable amounts in solitary and multiple lesions but are more abundant in the more extensive or chronic lesions of Hand-Schüller-Christian syndrome.
4. These entities may perhaps represent some type of immuno-allergic (hypersensitive) reaction to a still unknown infection, possibly viral.
