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Click Malignant fat-forming solitary fibrous tumor in a 61-year-old man. Contrast-enhanced CT (multidetector helical CT; 16 channels; 350 mAs; 120 kVp; 1.25 mm slice thickness, 100 ml of intravenous iodinated contrast medium), in the transverse plane, demonstrating a lobulated and heterogeneous solid mass located in the left supraclavicular fossa, containing enhancing solid nodules, thin septations and scattered low-density areas suggestive of fat.

Click Malignant fat-forming solitary fibrous tumor in a 61-year-old man. Contrast-enhanced CT (multidetector helical CT; 16 channels; 350 mAs; 120 kVp; 1.25 mm slice thickness, 100 ml of intravenous iodinated contrast medium), in the coronal plane, demonstrating a lobulated and heterogeneous solid mass located in the left supraclavicular fossa, containing enhancing solid nodules, thin septations and scattered low-density areas suggestive of fat.

Click Malignant fat-forming solitary fibrous tumor in a 61-year-old man. MRI: Axial T2-weighted (1.5 Tesla magnet, TR: 3983; TE: 117) showing a lobulated and heterogeneous solid mass located in the left supraclavicular fossa, with large areas of hypersignal intensity, identical to that of the subcutaneous adipose tissue. Moderately hyperintense solid nodules are present inside the mass.

Click Malignant fat-forming solitary fibrous tumor in a 61-year-old man. MRI: Pre-contrast axial T1-weighted (1.5 Tesla magnet, TR: 566; TE: 11) showing a lobulated and heterogeneous solid mass located in the left supraclavicular fossa, with large areas of hypersignal intensity, identical to that of the subcutaneous adipose tissue. Isointense solid nodules are present inside the mass.

Click Malignant fat-forming solitary fibrous tumor in a 61-year-old man. MRI: Post-contrast T1-weighted images, with fat-suppression (1.5 Tesla magnet, TR: 195; TE: 4; 15 ml of intravenous gadolinium contrast medium) showing a lobulated and heterogeneous mass located in the left supraclavicular fossa, with large areas of very low signal intensity, identical to that of the subcutaneous adipose tissue. The solid nodules inside the mass demonstrate moderate post contrast enhancement.