Figure 1.

Axial T1-weighted post contrast MRI of the nasopharynx with a primary tumour in the right lateral wall (arrows) demonstrating how MR depiction of small anatomical structures influences early T staging. (a) Tumour confined to the nasopharynx but displacing the levator palatini muscle (curved arrow) into the parapharyngeal fat space (stage T1); (b) tumour invades through levator palatini into the parapharyngeal fat space (stage T2b); (c) tumour confined to the nasopharynx but separated from an adjacent retropharyngeal node (curved arrow) by the pharyngobasilar fascia (stage T1/N1).