Magnetic susceptibility artifact
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There is a large magnetic susceptibility artifact resulting in distortion and non-visualization of left anterior quadrant.
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.
- Strigel RM, Moritz CH, Haughton VM et-al. Evaluation of a signal intensity mask in the interpretation of functional MR imaging activation maps. AJNR Am J Neuroradiol. 2005;26 (3): 578-84. AJNR Am J Neuroradiol (full text) - Pubmed citation
- Juzenas P, Juzeniene A. Reduction of cutaneous photosensitivity by application of ointment containing ferrous or cobaltous ions concomitant with the use of topical protoporphyrin IX precursors. Photodiagnosis Photodyn Ther. 2010;7 (3): 152-7. doi:10.1016/j.pdpdt.2010.06.003 - Pubmed citation