Materials and methods. The diagnostic accuracy of scintimammography with 99mTc-MDP was evaluated in 400 consecutive women with clinical or mammographic suspicion of breast cancer, candidate to surgery and/or excisional biopsy. Lateral views of both glands were acquired, in prone position, 5-10 min after the injection of 550-740 MBq of 99mTc-MDP. The scintigraphic results were compared to mammograms and classified using the histological findings as gold standard. Results. Mammography was suggestive for cancer in 231 (570/0), suspicious in 49 (12%) and indeterminate in 120 (31%) patients. Breast carcinoma was histologically proven in 330 women, benign breast diseases in 70. The tumor size ranged from 4x5 to 50x60 mm. 99mTc-MDP visualized as foci of increased uptake 305/330 cancers (920%). In particular, in women with indeterminate mammograms the SMM had a diagnostic accuracy of 84%, correctly characterizing 101/120 lesions. Twenty missed cancers had largest diameter ≤ 10 mm, 5 ≤15 mm. Lack of 99mTc- MDP uptake occurred in 64 out of 70 benign lesions. These lesions were classified as truly negative. Conversely, 3 fibroadenoma and 3 epithelial hyperplasia with moderate or severe atypia were falsely positive. The overall specificity was 91.5%; the accuracy was 92%, the positive and negative predictive values were respectively 98% and 72%. Conclusions. The results obtained in this study suggest that 99mTC-MDP scintimammography accurately detects breast carcinomas with largest diameter >10 mm; it differentiates malignant from benign lesions, and it shows promising insights in characterizing breast abnormalities mammographically indeterminate.
|Number of pages||26|
|Journal||Quarterly Journal of Nuclear Medicine|
|Publication status||Published - 1997|
- Breast neoplasms, radionuclide imaging
- Technetium Tc- medronate diagnostic use
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging