Table 2.

Differential table for solitary fibrous tumor (SFT)

Diagnosis	CT	MRI T1	MR T2	Pattern of contrast enhancement	PET
Solitary Fibrous Tumor (Benign variant)	Isodense to muscle	Hypo- or isointensity	Heterogeneous hyperintensity	Avid enhancement peripherally, heterogeneous enhancement centrally.	Low or no FDG avidity
High grade soft tissue sarcoma	Variable density, often with low- density necrotic areas	Variable	Heterogeneous hyperintensity	Variable - Often avid, nodular enhancement, sometimes peripheral	Typically high FDG avidity
Pancreatic Adenocarcinoma	Hypodense to pancreas	Iso- to hyperintense to pancreas	Iso- to hyperintense to pancreas	Low-attenuating enhancement	Typically high FDG avidity
Lymphoma	Typically isodense to muscle	Hypo- or isointensity	Variable	Typically homogenous moderate to avid enhancement	Typically high FDG avidity
Nerve sheath tumor	Hypodense to muscle.	Isointense	Hyperintense	Typically avid contrast enhancement.	Typically moderate to high FDG avidity
Retroperitoneal fibrosis	Ill-defined soft tissue density surrounding aorta	Hypointensity	Variable	Avid enhancement acutely to non- enhancement chronically	Variable
Extramedullary hematopoiesis	Lobulated iso- or hypodense mass	Isointense to muscle	Hyperintense to muscle	Variable enhancement	Low to moderate FDG avidity
Splenule*	Isodense to spleen	Isointense to spleen	Isointense to spleen	Similar to spleen	Low to moderate FDG avidity