From the case:
Magnetic susceptibility artifact
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There is a large magnetic susceptibility artifact resulting in distortion and non-visualization of left anterior quadrant.
Case Discussion
Magnetic susceptibility artifact results from local magnetic field inhomogenecities. On examination it is revealed that the patient had applied some skin ointment (in the particular region of artifact) for a local skin lesion.
Some skin ointments contain cobalt and ferrous ions to reduce cutaneous photosensitivity. Both cobalt and ferrous ions are strong ferromagnetic material and known to cause susceptibility artifacts especially on SWI sequence.
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