Haemangiopericytoma of nose and paranasal sinuses.

Haemangiopericytomas are uncommon vascular tumours found in almost every region of the body. The common sites are the soft tissues of limbs and head and neck. The incidence in head and neck ranges from 15 to 25% of all haemangiopericytomas. The uncertainty of the tumours is because of difficult histopathological nature and unpredictable biological behaviour. Its origin from the pericytes was described earlier by Stout and Murray who described these tumours clinically to be originating from the pericytes.