Aneurysmal bone cyst of the skull

The case of a 6 year old girl with aneurysmal bone cyst (ABC) presenting as a subperiosteal hematoma is reported. Postoperative computerized tomography revealed a new multicystic lesion suggestive of ABC which disappeared spontaneously about 1 month after the operation. The slowly progressing process and spontaneous disappearance of ABC in this case may be noteworthy when considering the surgical indication of this pathology.