PMC8645463_01
Magnetic resonance angiography showing a lesion with the appearance of a cerebral aneurysm at the right basilar artery-superior cerebellar artery junction (arrow).
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F1
BA-SCA lesion [Figure 1]. By contrast, the size of the MCA aneurysm had increased and the patient was admitted for further examination.
Selective left vertebral angiogram (oblique view) showing that the lesion is not an aneurysm, but rather involves an extremely tortuous right superior cerebellar artery at the anterior pontine segment (arrow). (a) Two-dimensional view. (b) Three-dimensional view.
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F2
However, there was no apparent aneurysm at the BA-SCA junction and the lesion was actually an extremely tortuous SCA at the anterior pontine segment [Figure 2]. The tortuous SCA formed a mass of arterial loops with a coil-like appearance [Figure 2].