We read the paper by Brock et al. [1] with great interest. They have treated the patient in a very good manner. Magnetic resonace imaging showed a thin blood collection all along the dural lining of the posterior dorsum sellae, clivus, and occipital bone down to the whole border of the foramen magnum. They reported that there was no blood collection in the subdural or subarachnoid spaces in the posterior fossa. Their report supplied considerable data on clival hematomas, which are reported rarely. We would like to add some comments on their article. (1) We consider that the blood was not located in the interdural space, but in the subdural space of the clival region.
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