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Pseudostenosis is a magnetic resonance angiography artifact that mimics arterial stenosis. In early arterial phase magnetic resonance angiography, pseudostenosis artifact of the subclavian artery can be seen due to susceptibility effects caused by residual gadolinium in the subclavian vein. Delayed phase-specific magnetic resonance imaging subclavian scanning shows that suspected pseudostenosis seen in the early arterial phase magnetic resonance angiography is no longer present during the venous phase. We present our case of a 21-year-old female with complaints of pain, fatigue, and numbness in the left arm that showed severe stenosis of the left subclavian artery in her upper extremity magnetic resonance angiography, but there was not any finding compatible with stenosis in her delayed phase dynamic magnetic resonance imaging with contrast. Clinicians and radiologists should consider repeating the imaging with contrast injection to the contralateral extremity or using a more special high-resolution delayed dynamic magnetic resonance imaging to confirm suspected true stenosis and avoid misdiagnosis.
Cite this article as: Önder, R. O., Akdeniz, C., & Tosun, A. (2023). Pseudostenosis artifact in the subclavian artery: A case report. Current Research in MRI, 2023;2(2):36-37.