Malignant lipoma cannot be called cancer in strict clinical sense. In clinical terms, tumors include benign tumors, malignant tumors and junctional tumors. Malignant tumors are defined mainly because they are prone to postoperative metastasis and recurrence even after radical resection surgery. According to their origin, malignant tumors that originate from epithelial cells, such as those from gastric mucosa and intestinal mucosa, are clinically called cancer. Those originating from mesenchymal tissue, non-epithelial origin are usually called malignant tumors or sarcomas. Malignant lipoma components are mainly fat cells and do not contain epithelial cells. Therefore, strictly speaking, it cannot be called cancer, but only malignant tumor or sarcoma.