Majority of the aneurysmal bone cyst affects tubular bones. The vertebra are also a frequent site ofaneurysmal bone cyst where they are usually found as an expanding, multiloculated new growth in the lamina orwithin the vertebral body. We present an aneurysmal bone cyst of cranial bone which is relatively rare. A 33 month-old girl was admitted to SNUH, complainin of progressive growing occipital mass or 14 months duration. Around, rubbery, child fist sized mass was situated at the suboccipital area. The mass was not tender, norpulsatile and bruits were not audible. Simple skull roentgenogram showed the huge, blown-out osteolytic lesion atthe suboccipital area. No vascularity within the mass was noted on the right brachial angiography. The mass wascomplete extirpated. The pathologic reports showed a typical aneurysmal bone cyst.