Presentation
Right shoulder lump.
Patient Data
![](https://prod-images-static.radiopaedia.org/images/141131/1a7d6f1784e04bac139f0b8856cca5_thumb.jpg)
![](https://prod-images-static.radiopaedia.org/images/141137/0b99a57c4cd102c4ed31b55d759d48_thumb.jpg)
![](https://prod-images-static.radiopaedia.org/images/141131/1a7d6f1784e04bac139f0b8856cca5_big_gallery.jpg)
Xrays of the shoulder demonstrate a low attenuation (lower than muscle, similar to fat) deep to the deltoid muscle. At the superior margin of the lesion is an area of dystrophic calcification. No bony erosion.
![](https://prod-images-static.radiopaedia.org/images/141113/3b703bad2b582af396906f0a04b4c4_thumb.jpg)
![](https://prod-images-static.radiopaedia.org/images/141125/0204e2f24028faaf33f68d4384913a_thumb.jpg)
![](https://prod-images-static.radiopaedia.org/images/141119/5b4d42256fe1a891cfbf373002a9cb_thumb.jpg)
![](https://prod-images-static.radiopaedia.org/images/141113/3b703bad2b582af396906f0a04b4c4_big_gallery.jpg)
MRI of the shoulder (selected images only) confirms the mass to be predominantly of tissue returning fat-signal with suppression on STIR. Only thin whispy vascular enhancement is seen. No solid enhancing/non-fatty component.
Case Discussion
These features are characteristic of a lipoma or less likely low-grade liposarcoma located deep to the deltoid muscle.
Follow-up over a number of years demonstrated no growth or local symptoms, making the diagnosis of a lipoma.