Osteosarcoma

Osteosarcoma involving the femur. The tumor has breached the cortex producing a bulky soft tissue mass encircling the bone. Areas of aneurysmal bone cyst formation, telangiectasis, hemorrhage, and necrosis extend through almost the entire length of the specimen. Image courtesy of Dr. Jean-Christophe Fournet, Paris, France; humpath.com; Used with permission