✓ The relationship of retained intracerebral sterile bone, unsterile bone, and combined scalp and hair to the development of intracranial abscess was studied in the dog. Sterile bone and unsterile bone were associated with abscess development in 7% of the cases. Scalp-and-fur and scalp-fur-and-bone were associated with abscess formation in 69% of the cases. The study suggests that clusters of retained bone fragments may point to potential areas of contamination by skin and hair that justify reexploration, but that isolated bone fragment may be left in place.

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Because skull elasticity has been demonstrated (through holographic interferometry), the assumption was made that even a small change in intracranial hydrostatic pressure might change the bitemporal diameter of the skull measurably. The authors devised a relatively noninvasive instrument for measuring skull diameter changes with changing intracranial pressure and evaluated its performance in cadavers and dogs, with encouraging results. With this method of measuring intracranial pressure, changes in pressure of as little as 2 mm Hg can be detected. The method measures relative rather than absolute pressure; it is postulated that this shortcoming can be overcome through further effort.

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