Bony expansion in skeletal metastases from carcinoma of the prostate as seen by bone scintigraphy.

We have presented three patients who had bony expansion due to metastatic carcinoma of the prostate demonstrated by roentgenography and bone scintigraphy. Bony expansion must be differentiated from the blooming phenomenon which may occur in areas of high radioactivity. Bony expansion is not specific for Paget's disease, but also occurs in many other benign and malignant conditions.