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[The rare phenomenon of intraosseous gas collections (the so-called pneumatoceles].

We present two unusual cases of gas-filled cavities, the first in a 5th lumbar vertebra, the second in the subcortical area of the iliac bone close to the iliosacral joint. These accumulations of gas are evidently connected to vacuum phenomena in anatomically adjacent joints. They are characterised as pneumatoceles. Different mechanisms of these rare intraosseous gas accumulations are discussed.