The diagnostic value of bone scan in patients with renal cell carcinoma

Purpose: Bone scan is performed as part of the evaluation of bone metastasi s. We assessed the diagnostic value of bone scan in patients with renal cel l carcinoma. Materials and Methods: Bone scan was performed at presentation in 205 patie nts with confirmed renal cell carcinoma. Abnormal hot areas were further ev aluated by x-ray, computerized tomography or surgery. Results: Of the 56 patients (27%) with an abnormal bone scan 32 (57%) had o sseous metastatic lesions. Overall bone metastasis was present in 34 of the 205 patients (17%). Bone scan had 94% sensitivity and 86% specificity. Of the 124 patients with clinically localized, stages T1-2N0M0 disease exclusi ve of bone metastasis 6 (5%) had bone metastasis only, whereas 28 of 81 (35 %) with locally advanced or metastatic disease had bone metastasis, includi ng 12 (35%) who complained of bone pain and 19 (56%) who presented with oth er symptoms due to local tumor growth or metastasis at other sites. Three p atients (9%) were asymptomatic. There was osseous metastasis without other metastasis, enlarged regional lymph nodes or bone pain in 7 patients, inclu ding 1 with stage T1b (2% of all with that stage), 2 with stage T2 (5%.), 1 with stage T3a (4%,), 1 with stage Tab (6%), 1 with stage Tic (14%) and 1 with stage T4 (6%) disease. Conclusions: Bone scan may be omitted in patients with stages T1-3aN0M0 tum ors and no bone pain because of the low proportion of missed cases with bon e metastasis.