72.58歲女性已切除子宮及卵巢,另患有骨盆腔惡性肉瘤,並接受手術及放射治療,主訴最近下背痛,X光及核 醫骨掃描如附圖,最可能的診斷為何?(A)bone metastasis(B)insufficiency fracture(C)local tumor recurrence(D)degenerative spine disease