Medial posterior choroidal artery [Neurosurgery Wiki]

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====== Medial posterior choroidal artery ======

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The medial posterior choroidal artery is a small branch (often multiple - 40% of hemispheres) usually arising from the P2 segment of the [[posterior cerebral artery]] (PCA). It may also arise from one of the PCA branches, e.g. parieto-occiptal, calcarine, splenial artery.

It ascends deep to the rest of the PCA and supplies small branches to the [[tegmentum]], [[midbrain]], posterior thalamus and [[pineal gland]] as the cisternal segment. It then penetrates the [[velum interpositum]], becoming the plexal segment. It then runs in the roof of the [[third ventricle]] supplying the ipsilateral [[choroid plexus]]. As it reaches the [[foramen of Monro]] it passes through it to anastamose with branches of the [[lateral posterior choroidal artery]]. 

===== Medial posterior choroidal artery aneurysm =====

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Aneurysms of the [[pineal region]] are rare and theoretically could arise from the medial posterior choroidal artery (MPChoA) or lateral posterior choroidal arteries (LPChoA). A 64-year-old lady with subarachnoid haemorrhage (SAH) and intraventricular haemorrhage (IVH) due to a ruptured MPChoA aneurysm was treated with microsurgical aneurysm excision via an [[occipital interhemispheric approach]]. This case demonstrates the importance of being mindful of rare aneurysm locations when initial vascular imaging in SAH appears normal
((Hall S, Wang D, Suresh V, Borg N, Bulters D. Ruptured aneurysm of the medial posterior choroidal artery in the pineal region: A rare location easily missed. J Cerebrovasc Endovasc Neurosurg. 2025 Mar 4. doi: 10.7461/jcen.2025.E2024.09.007. Epub ahead of print. PMID: 40033466.))