A malignant neoplasm characterized by the presence of a combination of liposarcomatous morphologic subtypes: myxoid/round cell and well differentiated/dedifferentiated liposarcoma or myxoid/round cell and pleomorphic liposarcoma. The disease is mixed liposarcoma (Monarch Disease Ontology entry MONDO_0003594). Also known as: mixed liposarcoma (morphologic abnormality).