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Selective venous sampling to confirm location of phosphaturic mesenchymal tumor.
FGF23 was measured at the indicated sites. While the data were suggestive of a lesion in the anatomical area of the T8/T7 vertebrae, they were not conclusive (e.g. levels in the left subclavian vein were high as well). Overall the findings were not considered to be diagnostic in that there was not a focal anatomical site that demonstrated a ratio > 1.6 over systemic circulation (Andreopoulou et al., 2011).
