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FIG 2. Case 3. Nodular fasciitis involving the right perinasal area in a 14-month-old boy.
Contrast-enhanced axial CT scan (A) and axial T1-weighted (B), T2-weighted (C), and contrast-enhanced T1-weighted (D) MR images show a well-defined, relatively thick-walled, round cystic mass in the subcutaneous fat just beneath the levator labii superioris muscle. Arrow in C indicates the same muscle in the contralateral cheek. Compared with CSF, the cystic portion of the lesion demonstrated slightly hyperintense signal intensity on T1-weighted image (B) and isointense signal intensity on T2-weighted image (C). Note peripheral rimlike enhancement of the lesion. The absence of imaging findings of associated infection, such as perilesional infiltration, edema, or enhancement does not favor the diagnosis of abscess.
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