2. CASE REPORT
A 60-year-old female presented to Najmiyeh hospital (a hospital in Tehran), with edema, progressive pain in the anterior-proximal side of the right forearm, palpation of well-defined masses with a high growing rate and movement limitation during forearm flexion. During physical examination, it was found that the mobile tumor mass with specific boundaries was inside the supinator muscle (anterior aspect of elbow joint) and did not have any inflammatory or secretion symptoms. Evaluation of the lesion with sagittal and coronal MRI T2-weighted sections showed that the 3.5 × 2.5 × 2 cm well-defined high signal mass was observed in the antero-proximal elbow joint and inside the supinator muscle (Figure1 and 2).