CT
Expansile destructive lytic lesion involving the sacral spine, i.e. S1, S2, and S3 vertebral bodies, with posterior extension to posterior elements and spinal canal, measuring about 8 x 5 x 7 cm (AP x TR x CC), associated with pathological fracture of S1 vertebral body. Slight extension to left sacroiliac joint.
Findings favor an aggressive bone tumor.