In a simplistic and succinct way, Liliequist membrane may be understood as a
projection formed by an arachnoid membrane extending from the dorsum sellae to
the mammillary bodies. In spite of being well known to neurosurgeons, many
radiologists neither know this anatomical structure nor give importance to its
study. The imaging evaluation of this membrane is feasible and may be
interesting for a better preoperative planning; postoperative evaluation of
third ventriculostomies; and understanding of suprasellar arachnoid cysts and
perimesencephalic hemorrhage. The present article illustrates the anatomy of the
membrane, with emphasis on imaging findings, besides describing its possible
clinical and surgical implications.
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