1) Chondroma of soft parts also affects the hands, but it is usually well circumscribed and has more well developed chondroid differentiation.

2) Results Most of intracranial chondroma were located at the position of junctura cartilaginea of basicranial skeleton.

3) Results:Primary pulmonary chondroma rarely, usually no special clinical features, CT and clinical diagnosis often associated with pulmonary hamartoma and tuberculoma and other benign lesions confused.

4) The differential diagnosis includes fibromatosis and chondroma of soft parts.

5) Careful evaluation of the calcifications is necessary to avoid confusion with other lesions such as osteosarcoma, chondroma, osteochondroma, or chordoma.

6) The T1 and T2 of metastasis, pituitary adenoma and chondroma were prolonged moderately.

7) Conclusion The ultrastructure characteristics support that the origin of intracranial chondroma is brephic embryonic rest of osteoprogenitor cells in the basicranial periost.