This is a case of left thigh posterior mass in a 75-year old female patient. Pathological examination of the specimen revealed spindle shaped cells suggestive of liposarcoma with intermediate grade of malignancy. MRI was done for this patient 33 days before taking the biopsy, and a week after confirming the diagnosis a PET scan was done as a part of the metastatic workup. After performing surgical resection of the tumor followed by radiotherapy, the patient showed no evidence of recurrence for 760 days of follow up. This is a 3D printable medical STL file converted from the real CT scan DICOM dataset of this patient(STS-016).