Fig. 2
![Fig. 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12957-018-1437-z/MediaObjects/12957_2018_1437_Fig2_HTML.png)
Painful large chondrogenic tumor at the proximal humerus prior to surgery without osteosynthesis. Plain radiograph (a) shows typical popcorn-like calcifications (arrow) inside the epiphyseal and metaphyseal lesion. STIR MRI sagittal series (b) and T1-weighted contrast-enhanced axial MRI series (c) reveal large size and aggressiveness with endosteal scalloping (arrow) reducing stability of the proximal humerus