Intracranial air occurring during life may arise from two possible sources: (1) it may be forced through a break in the cranial bony and meningeal coverings overlying the air spaces, or (2) it may be a product of microbic origin. In a recent article of mine1 the various aspects of pneumocephalus were considered at length, but my knowledge of this condition was then restricted to the first variety, in which the air was forced through an opening to the exterior. A case was presented, however, in which air was roentgenologically demonstrated in a cranial abscess, but the source of the air could not be absolutely determined. Although the air of bacterial origin was then considered a possibility, it was concluded, for reasons none too convincing when reviewed in retrospect, that more probably the air had entered through a break in the dura which was known to be present and
DANDY WE. PNEUMOCEPHALUS OF BACTERIAL ORIGIN. Arch Surg. 1927;15(6):913–917. doi:10.1001/archsurg.1927.01130240086006
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