Abstract
OBJECTIVE: To assess the clinical performance of the halo sign in tomosynthesis and synthesized 2D mammography, and to identify age groups where its diagnostic value may be greater. METHODS: 183 patients with nodules were recalled from the breast screening programme (with tomosynthesis and 2D synthesized mammograms). The patients were separated into two groups, 45-49 years and 50-69 years, and depending on the presence or not of halo sign. We calculated the predictive values for the different age groups. RESULTS: In 45-49 years group, 86 nodular lesions were recalled, 66 (76.7%) with positive halo sign and 20 (23.3%) with negative halo sign. In positive halo sign group, biopsy was considered in 23 (34.8%), with histological features of benignity. In 50-69 years group, 98 nodular lesions from 97 patients were recalled, 51 (52%) with positive halo sign and 47 (48%) with negative halo sign. In positive halo sign group, biopsy was considered in 13 (25.5%); four (30.8%) were malignant and nine (69.2%) were benign. CONCLUSION: Halo sign could be considered as a marker of benign lesion in females < 50 years. In females ≥ 50 years, other breast imaging techniques should be considered, with or without histological studies, to rule out malignancy. ADVANCES IN KNOWLEDGE: The trend of a positive halo sign to act as a marker of benign lesion could be improve the recall rate and positive predictive values in the breast screening programme with tomosynthesis and synthesized 2D mammography, especially in young females.