Temporal bone studies: findings with undecalcified sections in a 2,600-year-old Egyptian mummy.

Roentgenologic studies by polytomography of the temporal bones of a 2,600-year-old Egyptian mummy (PUM-II) revealed an increase in radiographic density throughout the left temporal bone. The superior portions of the petrous bones were removed with an electric saw for study by undecalcified techniques. For histological control, a similar specimen was removed from a cadaver immediately after autopsy. Light microscopy of sections showed excellent preservation of the Haversian systems. The vascular channels were clearly seen, and they were similar in appearance to those of the fresh specimen. The lacunae contained osteocytes with good preservation of the nucleus. Osteoid seams were identified and the osteon activity was described for the first time in an Egyptian mummy. There was a low turnover type of bone, but there was no evidence of metabolic bone disease. We postulate that the increased radiological density of the left temporal bone was due to a greater amount of resin infiltration in this bone as compared to the right. It appeared that the resin acted as a fixative preserving the bone cells and related elements.