[Radiological study on jaw lesions in patients with histiocytosis X]

Thirty two cases of histiocytosis X were collected in this present study. The posterior region of the mandible was the predominant site in histiocytosis X with jaw involvement. Jaw lesions could be divided into two types: 1. Type I (Alveolar Type)--the bone was destroyed along the alveola. This type is seen more frequently in the disseminated cases than in the eosinophilic granuloma of bone (EGB), and the majority of the lesions in this type manifested as ulcerative lesions clinically; 2. Type II (Jaw Body Type)--the mandibular body was destroyed in two ways which manifested as bony radiolucence with or without partitions. Most of the lesions had local swelling or massive manifestations clinically, and almost all lesions occurred in mandible, particularly in the cases of EGB.