Dynamic 18F-fluorodeoxyglucose positron emission tomography/CT in hibernoma: Enhanced tracer uptake mimicking liposarcoma

Figure 1 Computed tomography and magnetic resonance imaging. A: Computed tomography (upper row) and fused positron emission tomography/CT (PET/CT) (lower row) images of the retroperitoneal tumor; B: Magnetic resonance imaging (upper row), CT (middle row) and fused positron emission tomography/CT (PET/CT) (lower low) images of the tumor located in the left upper arm. Magnetic resonance imaging demonstrates a well-circumscribed mass without infiltration of the surrounding tissues. CT reveals a fat-equivalent mass, while PET/CT demonstrates intense fluorodeoxyglucose accumulation in the tumor area. CT: Computed tomography.

Figure 2 ¹⁸F-fluorodeoxyglucose positron emission tomography study. A: ¹⁸F-fluorodeoxyglucose (¹⁸F-FDG) positron emission tomography (PET) study of the retroperitoneal tumor; B: ¹⁸F-FDG PET study of the left upper arm tumor. Left row, FDG images (55-60 min after tracer injection) demonstrating an enhanced uptake in the left upper arm. Middle row, parametric images of the slope demonstrating an intense signal in the tumor area. Right row parametric images of the intercept demonstrating also an enhancement within the tumor area. The coordinate figure, corresponding time-activity curve of the ¹⁸F-FDG kinetics after application of a two-tissue compartment model.