Diagram of different types of bone tumors that can occur around the knee on XRay Age < 30 years: • Fibrous Dysplasia • Osteochondroma: pedunculated, sessile, cauliflower • Enostosis/bone island • Osteomyelitis or other aggressive lesion • Simple/unicameral bone cyst • Aneurysmal bone cyst • Osteoid osteoma • Ewing sarcoma • Enchondroma • Chondroblastoma • Osteosarcoma • Non-ossifying fibroma Age > 30 years: • Multiple Myeloma - punched out lesions. endostea/ scalloping • Healed NOF • Giant cell tumor • Chronic osteomyelitis - with sequestrum, cloaca, and involucrum • Paget disease - blastic or mixed lytic-blastic phase • Paget disease - lytic phase with flame/blade of grass sign • Parosteal Osteosarcoma • Aggressive lesion - lytic metastasis or osteomyelitis • Lymphoma or blastic metastatic lesion • Geode (AKA degenerative subchondral cyst, intraosseous ganglion) • Enostosis/bone island • Stress fracture • Chondrosarcoma • Stress fracture or intracortical Brodie abscess Dr. Matt Skalski @docskalski #Knee #Bone #Tumors #Lesions #Bony #Differential #Diagnosis #Radiology #XRay #MSK #pediatrics
