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Rare Multisystem Histiocytic Sarcoma on 18F-FDG PET/CT
Matthew Harwood1, Fiona E Craig2, Ming Yang3
1Department of Radiology, Mayo Clinic Arizona, Scottsdale, Arizona; and.
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.
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