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Pitfalls due to asymmetric physiological uptake. Coronal and axial (PET) and fused PET/CT images show reduction in physiological uptake (arrows in a,b,d) on the left side due to long term effects of radiation therapy. Note the relative increase in physiological uptake in the parotid and submandibular glands and the oropharynx on the contralateral normal side which can mimic pathology (arrowheads in a and d)
