What is the definition or description of: preseptal hematoma?

Hematoma: A hematoma (collection of blood) that pools on the septum of the nose after trauma. If left untreated it can cause a loss of fresh blood supply to the septum and destruction of the septum.Nose pain, a blue-purple mass in the nose, nose bleeding. . Examination of the nose using a nasal speculum establishes the diagnosis. A ct scan may be done to identify other associated injuries.