Plain radiograph showing a large lytic mass with soap bubble appearance
Obtain chest plain film to look for pulmonary metastasis
CT and MRI for more accurate assessment of<unk> 
Possibly can be done as outpatient
Biopsy for definitive diagnosis
Possibly can be done as outpatient
Giant cell tumor
Multiple myeloma
Ganglion cyst
Chondrosarcoma
Eumycetoma
Paget disease
Neuroblastoma 
Osteosarcoma