CHICAGO, Nov. 27, 2017 /PRNewswire/ -- Seno Medical Instruments, Inc. (Seno Medical), the leader in new technology for breast cancer diagnosis using opto-acoustic ultrasound (OA/US) imaging to differentiate benign from malignant masses, today announced positive data from PIONEER, a Phase III pivotal trial of its Imagio™ breast imaging system. The study found that OA/US was more specific than device gray-scale ultrasound alone (US) in differentiating malignant from benign breast lesions and was non-inferior to US with respect to sensitivity.