Non-mass lesions account for approximately 5% of all lesions seen on breast ultrasound. These lesions are also known as focal opacities, tubular structures, ductal changes, or non-mass lesions. Non-mass lesions have a wide spectrum of pathology. This spectrum ranges from benign (fibrocystic change or fibrostromal fibrosis) to ductal carcinoma in situ to invasive cancer.

Cancer is a dangerous disease that makes any patient afraid. Therefore, where cancer stem cells form or how cancer cells develop is also a matter of great interest and interest to many people.