Is it the blood background?
D002277:Carcinoma / Q000175:diagnosis*; D003951:Diagnostic Errors; D006801:Humans; D007457:Iodine Radioisotopes; D009362:Neoplasm Metastasis / Q000175:diagnosis*; D011877:Radionuclide Imaging; D013667:Technetium; D013964:Thyroid Neoplasms / Q000175:diagnosis*
D007457:Iodine Radioisotopes; D013667:Technetium