Fig. 2.

(A) Coronal T1-weighted and (B) axial T2-weighted fat-suppressed MR images demonstrate a well-circumscribed fat-containing mass (arrowheads) deep to the medial patellofemoral ligament. At the superior margin of the mass, there was an irregular region of T1-weighted and T2-weighted hypointense rim with central T1 hyperintensity (arrow) that demonstrated signal suppression, consistent with ossification. (C) Axial and (D) sagittal T1-weighted fat-suppressed postcontrast MR images show heterogeneously enhancement around the region of ossification (arrowheads). Incidentally, there is a “tear of the posterior horn” medial meniscus.