MKI67 and benign neoplasm: No significant differences (p > 0.05) were found in the mean Ki67 index between benign tumors (Group B: coefficient of variation, 76.57%; median, 19.60; minimum, 12.00; maximum, 77.20) and malignant CMTs (Group M1–3: coefficient of variation, 48.15%; median, 54.00; minimum, 7.00; maximum, 87.60).