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FIG 1. Correct identification of recurrent squamous cell carcinoma by Tl-201 SPECT.
A, Axial contrast-enhanced CT performed in a patient with a floor-of-mouth carcinoma 6 months after completion of combination radio- and chemotherapy. The study shows a heterogeneously enhancing mass that has soft-tissue (large straight arrows) and low-attenuation components (asterisk). Note erosion along the lingual cortex of the mandible (small straight arrows) and presence of gas (curved arrow). These findings were suspicious for recurrent tumor.
B, Axial thallium-201 SPECT obtained at the floor of mouth in the same patient illustrated in 1A. This study shows abnormal radiotracer uptake (arrow) in the region of the abnormality shown in 1A. Biopsy of this area revealed squamous cell carcinoma.
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