Fig. 6
A 35-year-old man with operated sphenoid sinus inverted papilloma. Axial post-operative computed tomography (a) reveals thick sclerotic septa that could be post-operative neo-osteogenesis rather than neoplastic induced. Axial T2-weighted reveals (b) the solid recurrent lesion as frond-like tissue on left side of the sphenoid cavity, with linear striations. Axial diffusion in (c) shows low spatial resolution reflected by too much bone-air interfaces, still apparent diffusion co-efficient map (d) nicely shows restricted tissue of only 0.9 × 10-3 cm2/s. Post-gadolinium image (e) shows enhanced solid component with too much less visibility of striations. Coronal computed tomography (f) reveals extension through the posterior nasal recess and endoscopic defect. Focal linear sclerosis of intra-sinus septum is seen (blue arrow) which may suggest surgery versus neoplasm induced