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Figure 1 An example of a "positive" case of NVC. (A) An axial image just below the pontomedullary junction (PMJ) showing a vessel in contact with the left ventrolateral medulla (solid arrow). The two high-signal-intensity structures (solid and open arrows) represent a high-looping left posterior inferior cerebellar artery (PICA). The reformatted maximum intensity projection (MIP) angiogram images demonstrate a high-looping left PICA in the lateral (B) and antero-posterior (C) projections. Note the position of the loop in relation to the PMJ. The position of the slice shown in A is denoted by the dotted line for reference. C = cerebellum; M = medulla; P = pons.