Fig. 1

Surgical treatment at the proximal humerus

Typical chondroid matrix (white arrows) is visible in ap x-ray (a) and coronal (c) and axial (d) T1 dotarem contrast-enhanced MRI. The decision to perform surgery was made due to local pain, lesion size and radiological signs of aggressiveness with endosteal scalloping (red arrows). After rigorous intralesional curettage and use of a high-speed burr, the lesion was filled with polymethylmethacrylate bone-cement (yellow arrows in b, e, and f).