CT evaluation of chondroblastoma

Chondroblastoma is a rare benign primary bone tumor with generally characteristic plain radiographic features. In some cases, however, the benign nature and the extent of the lesion may not be appreciated using conventional radiography. We report the CT findings of chondroblastoma in three patients. In one patient CT clearly defined cortical destruction, which was not well visualized on plain radiography or conventional tomography. In a second patient CT showed a sclerotic rim absent on plain radiography; this suggested the benign nature of the lesion. Other advantages and potential pitfalls of CT in evaluating chondroblastoma are discussed.