Table 3.

2-year follow-up upon validity of negative bone biopsy.

Biopsies (n = 215)	n (%)
Truly benign Negative biopsy or no biopsy from the same anatomy, no imaging with suspicion of malignancy from the same anatomy, and negative or no clinical suspicion of malignancy from the same anatomy	210 (98%) (95% CI 0.94–0.99)
Questionably benign Negative biopsy or no biopsy from the same anatomy, equivocal imaging of the same anatomy, and negative or no clinical suspicion of malignancy from the same location	3 (1%) (95% CI 0.001–0.03)
Truly malignant Positive biopsy from the same anatomy or from adjacent soft tissue or positive imaging or clinical suspicion of malignancy from the relevant anatomy	2 (1%) (95% CI 0.001–0.03)