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Liliequist membrane

The Liliequist membrane refers to an arachnoid membrane arising from the dorsum sellae to the anterior edge of the mamillary body.

Liliequist membrane is one of the earliest described sub-arachnoid membranes, recently upto 27 sub arachnoid membranes have been identified. This membrane is not routinely visualized in imaging studies as it is very thin. However it can be visualized on MRI CISS  heavily T2 weighted 3D sequences. Chiasmatic and perimesencephalic cisterns are separated by this membrane.

This membrane has neurosurgical importance especially in endoscopic and microinvasive surgery.


It was thought to be described by Key and Retzius in 1875 but rediscovered byLiliequist in 1956 in his pneumoencephalographic studies of cadavers.

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