Fig. (1) Representative ultrasonography findings of patients in this study. Grade III undifferentiated pleomorphic sarcoma in the thigh (67-year-old man). Hypoechoic, ill-defined, infiltrating margin (A) with prominent vascularization (Giovagnorio’s criteria type VI) (B). A score of 4 is assigned, indicating high-grade tumor (true positive). (C.) Grade I well-differentiated liposarcoma in the buttock (52-year-old man). Hyperechoic mass and undefined margin with limited marginal vascularity (Giovagnorio’s criteria type III). A score of 1 is assigned, indicating low-grade tumor (true negative). (D.) Grade I dermatofibrosarcoma protuberance in the shoulder (34-year-old man). Hyperechoic, well-defined margin with prominent vascularization (Giovagnorio’s criteria type VI). A score of 1 is assigned, indicating low-grade sarcoma (true negative). (E.) Grade III malignant peripheral nerve sheath tumor in the abdomen wall (74-year-old man). Hypoechoic, well-defined margin with limited marginal vascularity (Giovagnorio’s criteria type III). A score of 2 is assigned, indicating low-grade sarcoma (false negative).