Middle cerebral artery anomaly

Twig-like middle cerebral artery

Duplicated middle cerebral artery.

Accessory Middle cerebral artery 1).

Teal et al. 2) further classified two types of accessory MCAs based on the origin of variant vessels, which can be proximal (type 1) or distal (type 2) segments of the ACA 3).

1)
Uchino A, Kato A, Takase Y, Kudo S. Middle cerebral artery variations detected by magnetic resonance angiography. Eur Radiol. 2000;10(4):560-3. PubMed PMID: 10795531.
2)
Teal JS, Rumbaugh CL, Bergeron RT, Segall HD. Anomalies of the middle cerebral artery: accessory artery, duplication, and early bifurcation. Am J Roentgenol Radium Ther Nucl Med. 1973 Jul;118(3):567-75. PubMed PMID: 4723180.
3)
Gibo H, Carver CC, Rhoton AL Jr, Lenkey C, Mitchell RJ. Microsurgical anatomy of the middle cerebral artery. J Neurosurg. 1981 Feb;54(2):151-69. PubMed PMID: 7452329.