The amount of Ki67 positivity is not a basis for determining benign and malignant tumors. To determine whether a tumor is malignant or benign, the most accurate method is to obtain the tissue of the tumor for pathological examination.
Generally, the value of Ki67 for benign tumors is relatively low, mostly below 10%. Whereas most malignant tumors have a Ki67 value of 30% or more, some low-grade malignant tumors can maintain a Ki67 value of less than 10% for a longer period of time. Therefore the amount of Ki67 positivity does not determine whether a tumor is benign or malignant.
Pathological diagnosis is the gold standard for determining whether a tumor is malignant or benign, which cannot be replaced by other imaging tests, such as ultrasound, CT, or MRI.
If you want to know whether the tumor is benign or malignant, it is recommended to do pathological examination to confirm the diagnosis. Only when the diagnosis of malignant or benign tumor is confirmed can the treatment be more targeted.