@article {Harwood358, author = {Matthew Harwood and Fiona E. Craig and Ming Yang}, title = {Rare Multisystem Histiocytic Sarcoma on 18F-FDG PET/CT}, volume = {49}, number = {4}, pages = {358--359}, year = {2021}, doi = {10.2967/jnmt.121.262247}, publisher = {Society of Nuclear Medicine}, abstract = {Histiocytic sarcoma (HS) is a rare malignancy with morphologic and immunophenotypic features indicating histiocytic differentiation. We present a case of HS with multisystem involvement, including an obstructing mass in the pancreatic head. 18F-FDG PET/CT is a valuable tool in staging this rare entity and in assessing the response to therapy. Knowing the diverse metastatic pattern of HS will help avoid imaging pitfalls on clinical 18F-FDG PET/CT scans.}, issn = {0091-4916}, URL = {https://tech.snmjournals.org/content/49/4/358}, eprint = {https://tech.snmjournals.org/content/49/4/358.full.pdf}, journal = {Journal of Nuclear Medicine Technology} }