Eosinophilic Granuloma of the Mandible.

Eosinophilic granuloma (EG) is a rare histiocytic disorder resulting from clonal proliferation of Langerhans cells. Eosinophilic granuloma, the most benign of the three entities of Langerhans cell histiocytosis, may be multiple or solitary. This lesion can affect any bones but commonly involves the mandible when the jaws are affected.