Fetal PCA: Difference between revisions
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(Created page with "thumb * Fetal PCA origin: common variant, seen in ~20-30% of pts * Posterior Communicating Artery (PCom) size > P1 seg of PCA, provides most of blood supply → known as “fetal PCom” * P1 seg can be hypoplastic or absent → influences stroke pattern, as PCA functions as part of anterior circulation * PCom, larger than P1, allows for collateral circulation * Fetal PCA positioning: superior or superolateral to oculomotor nerve; non-fetal PCA: PC...") |
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[[File:Fetal PCA.png|thumb]] | [[File:Fetal PCA.png|thumb]] | ||
* Fetal PCA origin: common variant, seen in ~20-30% of pts | * Fetal PCA origin: common variant, seen in ~20-30% of pts | ||
* [[Posterior Communicating Artery]] (PCom) size > P1 seg of PCA, provides most of blood supply → known as “fetal PCom” | * [[Posterior Communicating Artery]] (PCom) size > P1 seg of [[PCA]], provides most of blood supply → known as “fetal PCom” | ||
* P1 seg can be hypoplastic or absent → influences stroke pattern, as PCA functions as part of anterior circulation | * P1 seg can be hypoplastic or absent → influences stroke pattern, as PCA functions as part of anterior circulation | ||
* PCom, larger than P1, allows for collateral circulation | * PCom, larger than P1, allows for collateral circulation | ||
* Fetal PCA positioning: superior or superolateral to [[Oculomotor Nerve|oculomotor nerve]]; non-fetal PCA: PCom superomedial to oculomotor nerve | * Fetal PCA positioning: superior or superolateral to [[Oculomotor Nerve|oculomotor nerve]]; non-fetal PCA: PCom superomedial to [[Oculomotor Nerve|oculomotor nerve]] | ||
== Potential complications == | == Potential complications == | ||
Latest revision as of 05:28, 3 August 2024
- Fetal PCA origin: common variant, seen in ~20-30% of pts
- Posterior Communicating Artery (PCom) size > P1 seg of PCA, provides most of blood supply → known as “fetal PCom”
- P1 seg can be hypoplastic or absent → influences stroke pattern, as PCA functions as part of anterior circulation
- PCom, larger than P1, allows for collateral circulation
- Fetal PCA positioning: superior or superolateral to oculomotor nerve; non-fetal PCA: PCom superomedial to oculomotor nerve
Potential complications
- Occlusion of fetal PCom can → occipital lobe infarction
- Large aneurysm alone not necessarily problematic for PCom occlusion, but parent arteries preservation preferred
- Multiple aneurysms: not independently assoc. w/ PCom dominance
- Vertebral artery hypoplasia: can be assoc. w/ fetal circulation, especially if bilateral, but not necessarily
- Persistent trigeminal artery: congenital anastomosis b/w internal carotid artery & basilar artery proximal to PCA
If bilateral:
- Basilar artery significantly smaller than normal.