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FIG 4. Case 7. Nodular fasciitis deeply seated in the right periorbital area in a 16-month-old boy.
Contrast-enhanced coronal CT scan (A) and coronal T1-weighted (B), coronal fat-suppressed T2-weighted (C), and coronal and axial contrast-enhanced fat-suppressed T1-weighted (D and E) MR images show a large, ill-defined, mixed solid and cystic mass deep to the temporalis muscle. The mass causes massive erosion of the adjacent bony orbit and skull. The signal intensity of the solid portion of the lesion was isointense to that of muscle on both T1- (B) and T2-weighted (C) images, whereas its cystic portion was slightly hyperintense and isointense to that of CSF on T1- (B) and T2-weighted (C) images, respectively. The mass also contains presumed hemorrhagic or highly proteinaceous components seen as high signal intensity on T1-weighted image (B). Note marked, peripheral, irregular, and nodular enhancement of the lesion.
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