Axial and coronal post contrast enhanced MRI scan confirming diffuse multicompartmental involvement with enhancement in the masticator and parapharyngeal spaces as described previously (blue arrows). In addition, there is better delineation of medial and posterior extension including pharyngeal mucosal space of the nasopharynx (red arrow), retropharyngeal space (green arrow) and perivertebral space (yellow arrow). Note the enhanacment in the right carotid space surrounding IJV and ICA (pink arrow). Coronal image delineates extension into right TMJ (purple arrow) explaining erosion or upper condylar head margin. Note no evidence of meningeal enhancement (orange) therefore no convincing intracranial extension. The diffuse nature of disease raises the possibility of an infective cause rather than neoplastic. (For interpretation of the references to colour in this Figure legend, the reader is referred to the web version of this article).