Fig. 2From: FDG-PET/CT pitfalls in oncological head and neck imaginga Axial PET/CT image reveals asymmetrical FDG uptake in the nasopharynx (arrow) in a patient with SCC of the floor of the mouth. Opacification of the right maxillary sinus due to mucous retention (asterisk). b Axial T2-weighted MR image at the same level depicts symmetrical lymphoid tissue within the nasopharynx without underlying pathology. Endoscopy confirmed absence of tumour. Mucous retention in the right maxillary sinus (asterisk)Back to article page