@article{cheung_mitchell_wong_2021,  title={Retroperitoneal liposarcoma in a nonagenarian},  volume={11},  ISSN={2236-1960},  url={https://doi.org/10.4322/acr.2020.224},  DOI={10.4322/acr.2020.224},  journal={Autopsy and Case Reports},  publisher={Hospital Universitário da Universidade de São Paulo},  author={Cheung, King Tung and Mitchell, Catherine and Wong, Enoch},  year={2021},  pages={e2020224} }