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Fig. 3 | BMC Cancer

Fig. 3

From: Mapping of sentinel lymph node drainage using SPECT/CT to tailor elective nodal irradiation in head and neck cancer patients (SUSPECT-2): a single-center prospective trial

Fig. 3

Example of SPECT/CT images. SPECT/CT images (a, b) and planar lymphoscintigraphy images (c) of a 64 year old patient with a T1 N1 base-of-tongue carcinoma. Fused SPECT/CT images are shown on the left panel, CT images are shown on the right panel. On the SPECT/CT images, 99mTc-nanocolloid tracer accumulation is visible, indicating the primary tumor (green arrow), the first ipsilateral draining area in level 2 (large blue arrow), and the decreasing tracer activity down the ipsilateral nodal chain into level 3 (small blue arrow). Furthermore, a contralateral draining area is visible in level 2 (red arrow). In the SUSPECT-2 study, this patient would be a candidate for a contralateral sentinel node procedure on the same day as the lymph drainage mapping. On the CT images, the arrows point to the lymph nodes that are thought to be the anatomical substrates that correlated with tracer accumulation

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