1. Three cases of cystic angiomatosis of bone are presented and the literature is reviewed.

2. The typical radiological appearances are described and illustrated.

3. The diagnosis must be confirmed by biopsy, and it is essential that the bone removed should be from an involved rib.

4. The prognosis is dependent upon extraskeletal visceral involvement and is not influenced by radiotherapy or chemotherapy. Splenectomy may improve the chance of survival when the spleen is the only viscus involved.