Radiologic features of eosinophilic granuloma of bone

We reviewed 349 proved cases of eosinophilic granuloma detected in 82 patients. Most bony lesions can be detected on plain radiographs. Bone scintigraphy may reveal additional lesions, especially in complex bones, although a radiographic bone survey tends to be superior in the detection of early lesions. CT or MR can be helpful in providing better delineation of a bone lesion, allowing easier assessment of the tumor's extraosseous extension into the adjacent soft tissues, and helping in the exclusion of spinal canal encroachment. CT is particularly helpful in confirming periosteal reaction and cortical invasion. It facilitates the evaluation of skeletal areas, such as the skull, facial, and pelvic bones, which are difficult to assess on radiographs.