Pelvic Osteosarcoma-CT

This is a 16 year old girl with left pelvic mass. CT shows evidence of areas of osseous destruction along with areas of spiculated new bone formation, sclerosis in the left iliac blade, ischium and left acetabulum with associated extensive soft tissue component extending intrapelvic and extrapelvic region. There is displacement of the bladder and pelvic viscera to opposite side. There are areas of ossification in the associated soft tissue. Nodular lymphnodes with ossification/calcification are seen in the left inguinal and femoral region. There findings are likely consistent with mitotic etiology, differentials include osteosarcoma.  Biopsy was consistent with osteosarcoma.