A liposarcoma characterized by the presence of round non-lipogenic primitive mesenchymal cells and small signet ring lipoblasts within a myxoid stoma with a branching vascular pattern. This category includes hypercellular lesions with round cell morphology, formerly known as round cell liposarcoma. The disease is MONDO_0013280 (myxoid liposarcoma). Also known as: myxoid liposarcoma (morphologic abnormality).