MRI susceptibility artefact due to dry hair shampoo
Chronic headache. Artefact on MRI scan. Patient sent home to wash hair and returned for repeat imaging.
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Susceptibility artefact in the left anterior scalp that disappears after the hairwash. Similar artefact associated with falcine ossification remains unchanged.
Dry shampoo is used to remove grease from unwashed hair and contains:
- cornstarch: to bind fatty acids
- kaolin: to absorb grease
- Laminaria saccharina extract: anti-clumping agent to reduce caking of the corn starch and kaolin
- magnesium stearate: also an anticlumping agent
- denatured alcohol: solvent for the cornstarch and kaolin
- liquefied petroleum gas: propellant for the spray can