Middle Cerebral Artery Duplication Linked to Bilateral Duplication of the Superior Cerebellar Arteries

Morphologic variations of the cerebral arterial circle are often recorded through imaging and cadaveric studies; however, the combinations of such variants remain rare. The current imaging report emphasizes a unique case identified through magnetic resonance angiography (MRA) of a 56-year-old male, revealing the coexistence of a (unilateral) duplication of the right middle cerebral artery (dMCA) with a (bilateral) duplication of the right and left superior cerebellar arteries (dSCA). The right dMCA (1.5 mm) originated directly from the right internal carotid artery, accompanying the typical right MCA (2.5 mm). In addition, the right and left SCA arose in duplicate patterns, with morphologic variations in origin relative to the posterior cerebral arteries. These findings contribute to the limited reports of concurrent arterial duplications within the cerebral arterial circle. Recognition of such rare variations is crucial for accurate diagnosis and surgical planning, especially in procedures involving aneurysm treatment or stroke intervention. Advanced imaging modalities like MRA and CTA remain essential in identifying these anomalies and guiding clinical decision-making.