Abstract Objective: To evaluate the indications for and results of magnetic resonance imaging (MRI) examinations for breast cancer screening at a cancer center in Brazil. Materials and Methods: This was a retrospective observational study, based on electronic medical records, of patients undergoing MRI for breast cancer screening at a cancer center in Brazil. Results: We included 597 patients between 19 and 82 years of age. The main indications for MRI screening were a personal history of breast cancer, in 354 patients (59.3%), a family history of breast cancer, in 102 (17.1%), and a confirmed genetic mutation, in 67 (11.2%). The MRI result was classified, in accordance with the categories defined in the Breast Imaging Reporting and Data System, as benign (category 1 or 2), in 425 patients (71.2%), probably benign (category 3), in 143 (24.0%), or suspicious (category 4 or 5), in 29 (4.9%). On MRI, 11 malignant tumors were identified, all of which were invasive carcinomas. Among those 11 carcinomas, six (54.5%) were categorized as minimal cancers (< 1 cm), and the axillary lymph nodes were negative in 10 (90.9%). The cancer detection rate was 18.4/1,000 examinations, and the positive predictive value for suspicious lesions submitted to biopsy was 37.9%. Conclusion: In our sample, the main indication for breast MRI screening was a personal history of breast cancer. The results indicate that MRI is a highly accurate method for the early detection of breast neoplasms in this population. Objective (MRI Brazil Methods study records Results 59 8 age 35 59.3%, 593 59.3% , 3 (59.3%) 17.1%, 171 17.1% 17 (17.1%) mutation 6 11.2%. 112 11.2% . 2 (11.2%) classified System category 2, 2) 42 71.2%, 712 71.2% 71 (71.2%) 3, 3) 14 24.0%, 240 24.0% 24 0 (24.0%) 5, 5 5) 4.9%. 49 4.9% 9 (4.9%) identified carcinomas 54.5% 545 54 (54.5% < ( cm, cm cm) 90.9%. 909 90.9% 90 (90.9%) 1841000 18 000 18.4/1,00 379 37 37.9% Conclusion sample population 59.3 (59.3% 17.1 (17.1% 11.2 (11.2% 71.2 7 (71.2% 24.0 (24.0% 4.9 (4.9% 54.5 (54.5 90.9 (90.9% 184100 00 18.4/1,0 37.9 59. (59.3 17. (17.1 11. (11.2 71. (71.2 24. (24.0 4. (4.9 54. (54. 90. (90.9 18410 18.4/1, 37. (59. (17. (11. (71. (24. (4. (54 (90. 1841 18.4/1 (59 (17 (11 (71 (24 (4 (5 (90 184 18.4/ (1 (7 (2 (9 18.4 18.
Resumo Objetivo: Avaliar as indicações e resultados de exames de ressonância magnética (RM) para rastreamento de câncer de mama em um centro oncológico no Brasil. Materiais e Métodos: Estudo observacional, realizado mediante análise retrospectiva de pacientes submetidos a RM das mamas para rastreamento de câncer de mama, por meio de revisão do prontuário eletrônico em um centro oncológico. Resultados: Foram incluídas 597 pacientes com idade variando de 19 a 82 anos. As principais indicações para rastreamento foram história pessoal de câncer de mama em 354 (59,3%) pacientes, história familiar em 102 (17,1%) e mutação genética confirmada em 67 (11,2%). O resultado da RM foi benigno (BI-RADS 1 ou 2) em 425 (71,2%) pacientes, provavelmente benigno (BI-RADS 3) em 143 (24,0%) e suspeito (BI-RADS 4 ou 5) em 29 (4,9%). Foram identificados 11 tumores malignos na RM, todos carcinomas invasivos, porcentagem de cânceres “mínimos” (< 1 cm) de 54,5% e porcentagem de axila negativa de 90,9%. A taxa de detecção de câncer na RM foi 18,4/1000 exames e o valor preditivo positivo para as lesões suspeitas submetidas a biópsia foi 37,9%. Conclusão: A principal indicação para RM de rastreamento na nossa população foi história pessoal de câncer de mama. Os resultados mostraram que a RM constitui um método com alta acurácia para detecção precoce de neoplasias da mama nessa população. Objetivo (RM Brasil Métodos observacional Resultados 59 8 anos 35 59,3% 593 3 (59,3% 10 17,1% 171 17 (17,1% 6 11,2%. 112 11,2% . 2 (11,2%) BIRADS BI RADS 42 71,2% 712 71 (71,2% 14 24,0% 240 24 0 (24,0% 5 4,9%. 49 4,9% 9 (4,9%) invasivos mínimos “mínimos < ( cm 545 54 54,5 909 90 90,9% 1841000 18 1000 18,4/100 379 37 37,9% Conclusão 59,3 (59,3 17,1 (17,1 11,2 (11,2% 71,2 7 (71,2 24,0 (24,0 4,9 (4,9% 54, 90,9 184100 100 18,4/10 37,9 59, (59, 17, (17, 11, (11,2 71, (71, 24, (24, 4, (4,9 90, 18410 18,4/1 37, (59 (17 (11, (71 (24 (4, 1841 18,4/ (5 (1 (11 (7 (2 (4 184 18,4 18,