Abstract

A sharp radiolucent defect in the region of the planum sphenoidale seen in a number of patients with and without head trauma was thought to be secondary to a developmental failure of osseous fusion of the planum sphenoidale with the chiasmatic sulcus in association with prominence of the sulcus. The radiographic characteristics of this defect are compared with the appearance of fracture of the planum sphenoidale. Its incidence was approximately 0.7% in the adult population.

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