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Radiation Induced Rib Fractures on Bone Scan after Breast Cancer Surgery and Radiation Therapy  

Kim, Hae-Won (Departments of Nuclear Medicine, Keimyung University, School of Medicine)
Won, Kyoung-Sook (Departments of Nuclear Medicine, Keimyung University, School of Medicine)
Zeon, Seok-Kil (Departments of Nuclear Medicine, Keimyung University, School of Medicine)
Kim, Jin-Hee (Department of Radiation Oncology, Keimyung University, School of Medicine)
Publication Information
Nuclear Medicine and Molecular Imaging / v.43, no.4, 2009 , pp. 287-293 More about this Journal
Abstract
Purpose: This study is to evaluate rib fractures on bone scan in breast cancer patients treated with breast cancer surgery and radiation therapy and to evaluate its relation with radiation therapy and operation modality. Materials and Methods: Two hundred seventy cases that underwent serial bone scan after breast cancer surgery and radiation therapy were enrolled. Bone scan and chest a findings of rib fracture were analyzed. Results: The rib uptake was seen in 74 of 270 cases (27.4%) on bone scan and 50 cases (18.5%) were confirmed to have rib fracture by chest CT. The rate of modified radical mastectomy in patients with rib fracture was significantly higher than that in patients without rib fracture (66.0% vs. 27.0%, p = 0.000). The rate of additional radiation therapy to axillar or supraclavicular regions in patients with rib fracture was significantly higher than that in patients without rib fracture (62.0% vs. 28.6%, p =0.000). Rib fracture was seen most frequently at 1-2 years after radiation therapy (51.9%) and single rib fracture was seen most frequently (55.2%). Of total 106 rib fractures, focal rib uptake was seen in 94 ribs (88.7%) and diffuse rib uptake was seen in 12 ribs (11.3%). On one year follow-up bone scan, complete resolution of rib uptake was seen in 15 ribs (14.2%). On chest a, the rate of fracture line in ribs with intense uptake was significantly higher than that in ribs with mild or moderate uptake (p = 0.000). The rate of presence of fracture line in ribs with focal uptake was significantly higher than that in ribs with diffuse uptake (p = 0.001). Conclusion: Rib fracture in breast cancer patients after radiation therapy was related to radiation portal and operation modality. It should be interpreted carefully as a differential diagnosis of bone metastasis.
Keywords
Breast cancer; bone scan; radiation therapy; rib fracture;
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