Fig. 3

Conservative treatment at the proximal humerus

Typical chondroid matrix (white arrows) is visible in ap X-ray (a) and axial (b), coronal (c), and sagittal (d) T1 dotarem contrast-enhanced MRI. Local pain, size and radiological signs of aggressiveness with endosteal scalloping (red arrows) caused presentation and follow-up in our orthopaedic oncology department. The patient declined surgical excision, and was regularly followed-up with MRI and x-ray to rule out significant tumor growth or increase in endosteal scalloping.