Other Rare Sinonasal Malignant Tumours Involving the Anterior Skull Base.

Sinonasal tumours are rare, and among these there exist a small number of histologic subtypes that are infrequently encountered and rarely mentioned in the literature. These have been presented as either case reports or small case series, and their very low incidence makes prospective studies practically impossible. This review analyses the available literature, including our own experience and endeavours to outline management strategies, which involve a high index of suspicion and counselling of patients. In most instances, these tumours require aggressive multimodal treatment to improve survival outcomes. The overall prognosis remains dismal.