Fig. 11.

Image of planar scintigraphic examination performed with either “single-tracer double-phase” technique or with “double tracer subtraction” technique, with false negative result (failure to visualize the pathological parathyroid); the parathyroid adenoma (right inferior, solid and with a maximum diameter of about 2.8 cm) had already been visualized by the CDHR-NUS (see Fig. 4)