J Korean Soc Radiol.  2014 Nov;71(5):254-257. 10.3348/jksr.2014.71.5.254.

Intra-Articular Nodular Fasciitis of the Knee: A Case Report of MRI Findings

• Kwon OH
• Cho KH
• Suh JH
• Choi JH

• KMID: 2208795
• DOI: http://doi.org/10.3348/jksr.2014.71.5.254

Abstract

Nodular fasciitis, a benign soft tissue tumor consisting of myofibroblastic proliferation, is commonly located in the subcutaneous or inter- or intra-muscular layer of extremites. Intra-articular nodular fasciitis is extremely rare. We report a case of MRI findings of a nodular fasciitis in the knee of a 13-year-old boy which was removed by arthroscopic surgery and pathologically confirmed.

MeSH Terms

Adolescent
Arthroscopy
Fasciitis*
Humans
Knee*
Magnetic Resonance Imaging*
Male
Myofibroblasts

Figure

• 

  Fig. 1 Magnetic resonance imaging in a 13-year-old man with intra-articular nodular fasciitis of left knee. A. Fast spin echo axial T2-weighted image shows a well defined mass (arrowheads) with a increased signal intensity compared to normal muscle. Area of low signal intensity suggesting collagen-rich stroma is seen in ventral aspect of the mass. This mass is located in the joint capsule of inferomedial aspect of patella. Joint effusion is also noted. B. Sagittal T1-weighted image reveals iso- to slightly high signal intensity to the normal muscle. C. Gradient coronal T2-weighted image demonstrates well defined homogeneous high signal intensity. D. Coronal T1-weighted image also shows well defined iso- to slightly high signal intensity of the mass.

• 

  Fig. 2 Pathologic images of the intra-articular nodular fasciitis. A. Microphotograph shows myofibroblastic cell proliferation in the subsynovial layer (H&E; × 40). B. Mixed collagenous and myxoid stroma is seen (H&E; × 100). C. Immunohistochemical staining shows a positive reaction with a-smooth-muscle actin (× 200).

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