Suspicious lesions on breast MRI exams performed following neoadjuvant therapy are relatively rare and unlikely to be cancerous, according to a new retrospective study. Currently, there are no guidelines for managing these suspicious imaging findings spotted on exams performed over the course of breast cancer treatment, researchers explained in the American Journal of Roentgenology. After analyzing more than 400 MRIs, researchers found unusual lesions in 5.5% of cases.