Basilar venous plexus of the posterior fossa: a potential source of error in petrosal sinus sampling.

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Abstract
Sampling of serum from the [human] inferior petrosal sinus can provide important information about the source [microadenoma] of elevated ACTH levels. This often leads to improved results of pituitary surgery for Cushing disease. A successful catheterization technique is described and the venous anatomy of the inferior petrosal sinuses and basilar plexus is illustrated [by venography].