Fig. 1

a, b Computed tomography scan showing a osteolytic bone lesion with poorly defined borders of the maxilla enclosing the deciduous incisor and canine, which resulted in the swelling of the alveolar cortical bone. c, d The lesion was composed of Langerhans cells with abundant cytoplasm and undefined cell borders, which were admixed with eosinophils and other inflammatory cells (c hematoxylin and eosin stain, original magnification ×10; d hematoxylin and eosin stain, original magnification ×20). e Immunohistochemical stain for Langerhans cell-specific CD1a antigen showing strong positive staining of neoplastic cells (original magnification ×20). f Mild positive staining for CD31 antigen (original magnification ×20)