An aneurysmal bone cyst originating from the squamous portion of the left temporal bone is reported. The lesion presented in a 62-year-old nonhypertensive man as a spontaneous, intraparenchymal left temporal lobe hematoma. No evidence of trauma, hermorrhagic diathesis, or concurrent systemic disease was found. Previous case reports of aneurysmal bone cysts of the skull are reviewed.

A 27-year-old man sustained a fracture of the orbital roof and a basofrontal dural tear in a motor-vehicle accident. One week later, he developed an orbitocranial dural fistula manifested by an orbital cyst, pulsatile proptosis, and serous drainage from the eye. Specific diagnosis was established only after computerized tomography metrizamide cisternography demonstrated direct communication of the orbital cyst with the subarachnoid space. The pertinent literature is reviewed.