title: Giant Cell Tumor of the Tendon Sheath With Discordant Metabolism as a False Positive on Staging of Mantle Cell Lymphoma.
abstract: A baseline F-FDG PET/CT scan in a patient with mantle cell lymphoma showed diffuse minimally FDG-avid lymphadenopathy and splenomegaly. There was also a focus of uptake in the left subscapularis muscle without a CT correlate. A post-chemotherapy scan showed interval decrease in size, and resolution of FDG uptake, of the lymph nodes and spleen. Persistent activity was seen in the subscapularis muscle. Posttreatment biopsy of the FDG-avid lesion showed a benign giant cell tumor of tendon sheath. This case illustrates that a lesion with a markedly discordant SUV should raise suspicion for a second process.
authors.affiliation: From the Departments of *Diagnostic Radiology and Nuclear Medicine, †Pathology, and ‡Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD.
authors.forename: Alireza
authors.initials: A
authors.lastname: Rezaee
authors.forename: Wengen
authors.initials: W
authors.lastname: Chen
authors.forename: Vasken
authors.initials: V
authors.lastname: Dilsizian
authors.forename: Qing
authors.initials: Q
authors.lastname: Chen
authors.forename: Amy S
authors.initials: AS
authors.lastname: Kimball
mesh_terms: D005189:False Positive Reactions; D019788:Fluorodeoxyglucose F18 / Q000378:metabolism; D005870:Giant Cell Tumors / Q000000981:diagnostic imaging* / Q000473:pathology; D006801:Humans; D020522:Lymphoma, Mantle-Cell / Q000000981:diagnostic imaging* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D064847:Multimodal Imaging; D049268:Positron-Emission Tomography; D019275:Radiopharmaceuticals; D014057:Tomography, X-Ray Computed
chemical_list: D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18