18 F-FDG PET/CT in a Patient With Primary Rectal Angiosarcomas and Multiple Bone Metastases.

A 54-year-old man presented with a 1-month history of pain and numbness in the right lower limb. Lumbar spine MRI revealed bone metastases. 18 F-FDG PET/CT showed a soft tissue mass with increased 18 F-FDG uptake in the rectum, accompanied by multiple hypermetabolic lesions in the bilateral ribs, spine, pelvis, and upper right femur. A colonoscopy biopsy of the submucosal rectal mass confirmed the diagnosis of epithelioid angiosarcoma.