The patient was 19-year old male who noticed pain of the right knee in May, 1975.
He was examined by three doctors before visiting our hospital. No one could point out abnormal findings radiographically. On May 2nd, 1977 radiographic findings revealed a large radiolucent area strongly suggesting giant cell tumor.
We convinced our clinical diagnosis by hypervascularity on angiogram and moderate activity on scintigram.
But in fact, it was found to be typical chondroblastoma on macroscopical and histological findings.
Because of signs of biological activity follow-up study will be necessary.
