PMC6710791_01
Magnetic resonance imaging (MRI) showed a lobulated multiseptated lesion seen within left supinator muscle as delineated by the red arrows, which showed a hyperintense signal on T2-weighted images (T2WI) (b, e) and hypointense on T1-weighted images (T1WI) (a, d), with peripheral enhancement post contrast (c).
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fig1
T2-weighted images (T2WI) and hypointense on T1-weighted images (T1WI), with peripheral enhancement post contrast (Figures 1(a)-1(e)). The PIN was reported as being encased/impinged by the tumor.
Intraoperative photograph showed the left supinator intramuscular myxoma encasing the posterior interosseous nerve (PIN). The course of the PIN had been changed to near horizontal as drawn by the yellow line due to encasement.
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fig2
The PIN was encased by the tumor (Figure 2).