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(Radiology. 2000;215:41-44.)
© RSNA, 2000

Radiation Oncology

Frequency of Coexistent Disease at CT in Patients with Prostate Carcinoma Selected for Definitive Radiation Therapy: Is Limited Treatment-planning CT Adequate?1

Jeffrey S. Miller, MD, Michael L. Puckett, MD and Peter A. S. Johnstone, MD

1 From the Department of Radiology (J.S.M., M.L.P.), Radiation Oncology Division (P.A.S.J.), Naval Medical Center San Diego, 34800 Bob Wilson Dr, Suite 14, San Diego, CA 92134-1014; and the Division of Radiation Oncology, University of California, San Diego (P.A.S.J.). Received June 3, 1999; revision requested July 14; revision received September 1; accepted September 15. Address reprint requests to P.A.S.J. (e-mail: pajohnst@nmcsd.med.navy.mil).

PURPOSE: To document the frequency of clinically important coexistent disease depicted at contrast material–enhanced abdominal and pelvic computed tomography (CT) in patients undergoing definitive radiation therapy for prostate carcinoma, as such lesions might be missed at limited nonenhanced treatment-planning CT.

MATERIALS AND METHODS: Of 133 consecutive patients with prostate carcinoma who were referred to the radiation oncology division between January 1, 1994, and December 31, 1996, 77 underwent definitive radiation therapy that required either contrast-enhanced abdominal and pelvic CT (n = 67) or contrast-enhanced pelvic CT (n = 10). Results of these studies were reviewed and retrospectively categorized.

RESULTS: Forty-eight (62%) of the 77 patients had either negative studies or minor abnormalities that did not require further follow-up. Only two patients (3%) had major abnormalities that required intervention. Five patients (6%) had new findings of clinically important coexistent disease, but no intervention was required.

CONCLUSION: The incidence of clinically important coexistent disease in patients with prostate carcinoma who are referred for definitive radiation therapy is low. Therefore, contrast-enhanced abdominal and pelvic CT in addition to treatment-planning CT is of limited value.

Index terms: Abdomen, CT • Computed tomography (CT), contrast enhancement, 844.12113 • Computed tomography (CT), treatment planning • Cost-effectiveness, 844.30 • Prostate neoplasms, CT, 844.1211, 844.12113, 844.32




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