Malignant sinonasal tumors are the most frequent facial malignancies in adults. Assessment of these tumors requires a multidisciplinary approach and imaging plays a major role to define the precise tumor location, volume and extension and to plan post-treatment follow-up. MRI provides superior differentiation between tumor and surrounding tissues and depiction of intracranial or perineural extension. CT is a useful complement to demonstrate bone erosion or extension into the skull base.