Extraskeletal osteosarcoma is a rare, high-grade soft tissue malignancy, accounting for approximately 1% of all soft tissue sarcomas. Despite the histologic resemblance to osteogenic osteosarcoma, it is considered as a distinct entity because of the differences in clinical behavior and response to treatment. Hence, imaging plays a vital role in establishing the nonskeletal origin of the tumor, differentiating it from osteogenic osteosarcoma. We present 18F-FDG PET/CT findings in a case of isolated primary extraskeletal osteosarcoma confirmed on histopathology.
From the Departments of *Nuclear Medicine and PET/CT and
†Orthopaedics, Post Graduate Institute of Medical Education and Research, Chandigarh, India.
Received for publication July 17, 2018; revision accepted August 18, 2018.
Conflicts of interest and sources of funding: none declared.
Correspondence to: Bhagwant Rai Mittal, MD, DNB, Department of Nuclear Medicine, Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India. E-mail: firstname.lastname@example.org.