e-CASES: Enchondroma of the proximal humerus
Incidental finding of a left proximal humerus lesion.
Lytic lesion with well defined margins, no periosteal reaction and popcorn like calcifications of the left proximal humerus (@1.1).
Six centimeters lesion of the proximal humerus with lobulated contours and very high signal intensity on T2-weighted images with fat suppression (@2.9).
Focal regions of signal drop out corresponding to calcifications (@4.14) seen on x-rays.
The lesion is well-defined with normal marrow fat interposed between the cartilaginous lobules (@5.10).
After administration of gadolinium, there is a peripheral and septal ("rings and arcs") enhancement (@6.9).
No endosteal scalloping, no periosteal reaction, no soft tissue mass.
Radiograph and MRI demonstrate benign cartilaginous lesion which most likely represents enchondroma of the humerus.
Enchondroma of the proximal humerus
- Low grade chondrosarcoma
- Bone infarct
- Well defined
- No cortical scalloping
- No soft tissue mass