Semilunar osteoblastic metastases in breast carcinoma. A new radiological sign.

Forty-seven cases of osteoblastic skeletal metastases were examined, of which 26 were from primary carcinoma of the breast. In two of these cases the metastases were of an unusual semicircular configuration. In each case the patient survived for at least four years after the discovery of metastases. This appearance may represent a better form of host response to metastatic disease.