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A 67-year-old man underwent cerebral MRA using a 3 tesla scanner with a standard 3D time-of-flight MRA protocol (22.0-ms repetition time, 3.45-ms echo time, 17o flip angle, 20.0 cm × 20.0-cm field of view, 0.65-mm slice thickness). Assessment of maximum-intensity-projection (MIP) images of MRA revealed a large arterial ring formed from the fusion of a small artery arising from the middle M1 segment of the right middle cerebral artery (MCA) with one of the proximal branches of the M2 segment (Fig. 1). We created 3D partial volume-rendering (VR) images to depict the variation more clearly and confirm the anomalous artery (Fig. 2).

Large Arterial Ring Formed between the M1 and M2 Segments of the Right Middle Cerebral Artery Diagnosed with MR Angiography