PET/CT and MRI of chondroid lipoma of the deltoid muscle.

Chondroid lipoma is an uncommon benign tumor of mesenchymal origin characterized by the presence of adipose tissue and chondroid matrix. Its imaging features have been reported with radiography, ultrasonography, CT, and MRI. Because this lesion may be mistaken histologically for myxoid liposarcoma and myxoid chondrosarcoma, it is of value, through this presentation, to raise the awareness of this benign tumor, which may demonstrate prominent 18F-FDG avidity on PET/CT imaging. The authors present a case of a 52-year-old male patient with a 6-month history of painless chondroid lipoma of the left shoulder.