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Click 11 year-old girl with diagnosis of angiomatoid fibrous histiocytoma. Axial fat suppressed gradient echo images (TR 185, TE 2.27, 1.5 Tesla MR scanner, noncontrast) demonstrate a 1.9 x 3.3 x 3.2 cm well-circumscribed, ovoid, mixed cystic and solid mass is present in the subcutaneous fat of the lateral, distal right thigh abutting the vastus lateralis fascia without evidence of muscle infiltration. The lesion is homogeneously hypointense (isointense to muscle). The periphery of the mass demonstrates the typical low signal on nonenhanced images representing a fibrous pseudocapsule.

Click 11 year-old girl with diagnosis of angiomatoid fibrous histiocytoma. Axial fat suppressed gradient echo images (TR 185, TE 2.27, 1.5 Tesla MR scanner, after 16 mL of Magnevist intravenous contrast injection) demonstrate variegated and micronodular peripheral gadolinium enhancement, as well as nodular peripheral foci of susceptibility artifact on gradient echo images.

Click 11 year-old girl with diagnosis of angiomatoid fibrous histiocytoma. Axial T2 weighted fat suppressed images demonstrate a 1.9 x 3.3 x 3.2 cm well-circumscribed, ovoid, mixed cystic and solid mass is present in the subcutaneous fat of the lateral, distal right thigh abutting the vastus lateralis fascia without evidence of muscle infiltration. The lesion is heterogeneously hyperintense on T2WI. The periphery of the mass demonstrates the typical low signal on nonenhanced images representing a fibrous pseudocapsule. T2 hyperintensity tracks minimally in the adjacent peritumoral fascial planes representing edema.

Click 11 year-old girl with diagnosis of angiomatoid fibrous histiocytoma. Coronal STIR images (TR 3100, TE 63.14, 1.5 Tesla MR scanner) images demonstrate a 1.9 x 3.3 x 3.2 cm well-circumscribed, ovoid, mixed cystic and solid mass is present in the subcutaneous fat of the lateral, distal right thigh abutting the vastus lateralis fascia without evidence of muscle infiltration. The lesion is homogeneously hypointense (isointense to muscle) on T1WI and heterogeneously hyperintense on T2WI. The periphery of the mass demonstrates the typical low signal on nonenhanced images representing a fibrous pseudocapsule.