Fig. 8
From: FDG-PET/CT pitfalls in oncological head and neck imaging
Axial (a) and coronal (b) PET/CT images illustrate high FDG uptake of the right submandibular gland (arrows) and soft tissues of the neck (asterisk) in a patient investigated for histiocytosis. The left submandibular gland (arrowhead) shows moderate FDG uptake. Note that the hypermetabolic submandibular gland can be easily mistaken for lymphadenopathy unless coronal images are carefully analysed. Corresponding axial (c) and coronal (d) CECT images reveal slightly increased enhancement of the right submandibular gland (arrows), reticulated aspect of subcutaneous fatty tissue (asterisk) and thickening of the right platysma muscle due to sialadenitis with phlegmon. Dashed arrows in d point at the phlegmon extending cranially in the masticator space. US revealed lithiasis as the cause of sialadenitis