Pain and edema over a joint near a long bone (usually around the knee)
Classically in a young female adult
Can present as a pathological fracture
Nearly all present with just a single<unk>  site
Classically in a young female adult
Giant cell tumor
Multiple myeloma
Ganglion cyst
Chondrosarcoma
Eumycetoma
Paget disease
Neuroblastoma 
Osteosarcoma