Spongious bone density determination for staging and follow-up of patients with prostatic cancer.

Quantitative computerized tomography (QCT) of vertebral bodies could reveal metastatic spread of prostatic cancer before such lesions are seen with standard examinations. Focal increase in the density of the spongious bone in face of normal bone scan and serum acid phosphatase is suggestive of metastasis, but certitude is gained only if further increase in density or structural bone changes are demonstrated on follow-up studies. QCT also may provide an objective measurement of tumor response to therapy.