(a) Axial T1 magnetic resonance imaging (MRI) of the left thigh showed the two distinctive mass of low-to-intermediate and high signal intensity. (b) Axial T2 MRI demonstrated the mass with heterogeneously high and high signal intensity, representing lipogenic mass and non-lipogenic mass in the adductor muscles. (c) Axial view of the resected specimen showed yellow lipomatous and yellow firm lesion. (d) Low-power of microscopical findings demonstrated an abrupt transition (magnification ×20). (e) Well-differentiated liposarcoma showing scattered lipoblast was found (magnification ×200). (f) Dedifferentiated area, mimicking the appearance of malignant fibrous histiocytoma, was found (magnification ×200).