Computerized tomography in typical hyperostosis cranii (THC).

THC is a remodelling process affecting the bones of the neurocranium. CT analysis shows that both the inner and the outer table as well as the diploë can be involved in this process. The term typical hyperostosis cranii (THC) replaces the terms derived from conventional radiography such as nebula frontalis, hyperostosis frontalis interna, etc., as CT shows transitional stages between them. A new type of THC is described. There are morphological similarities between THC and Paget's disease in CT.