The lesions were classified solitary or multiple, based on bone scan results and then according to anatomical distribution. The sites of involvement in whole group are cranium 11%, rib-sternum- scapula 29%, vertebrae 29%, pelvis 17%, upper extremities 1% and lower extremities 13%. The vertebrae and rib-sternum-scapula regions were a frequent site for solitary and multiple skeletal metastases.
Thoracic and lumbar vertebral skeletal sites (77%) (150/194) were most frequent in patients with vertebral metastasis (χ2=58.660, df=3, p<0.001). Rib metastasis were most frequent in ribsternum- scapula skeletal region (54%) (86/158) (χ2=86.101, df=3, p<0.001).
Bone metastasis has a different distributions ratio in six main anatomical part of skeletal system in breast cancer. Thoracolumbar vertebral sites need to special attention for follow up avoiding for metastatic complications.
Keywords: Breast cancer, bone metastasis, retrospectively analyses
