IMAGING FEATURES OF MAXILLARY OSTEOBLASTOMA AND ITS MALIGNANT TRANSFORMATION

We report two cases of osteoblastoma, one of them an unusual case in a 32-year-old woman in whom a maxillary tumor was confidently diagnosed as an osteoblastoma at the time of primary excision and subsequently transformed into an osteosarcoma 7 years after the onset of clinical s ymptoms. The other patient developed osteosarcoma arising in the maxil la, which was diagnosed 3 years after the primary excision and is very suggestive of malignant transformation in osteoblastoma. We present t he radiological features, including computed tomographic and magnetic resonance imaging studies, of this unusual event of transformed tumor and compare imaging features of benign and dedifferentiated counterpar ts of this rare tumor complex.