Table 3.

Capanna classification.

Capanna class	Pelvis
Class 1	Solitary metastatic lesion Primary with good prognosis Interval over 3 years since detection of primary tumor
Class 2	Pathological fracture in the periacetabular region
Class 3	Supra-acetabular osteolytic lesion
Class 4	Multiple osteoblastic lesions at all sites Osteolytic or mixed lesions in iliac wing and anterior pelvis Small periacetabular osteolytic lesions