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The imaging appearance of crayons.

Aaron S McAllister1, Neil U Lall2,3, Kareem O Tawfik4

  • 1Department of Radiology, Cincinnati Children's Hospital Medical Center, 3333 Burnet Ave., Cincinnati, OH, 45229, USA. aaron.mcallister@cchmc.org.

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Imaging a crayon foreign body can be challenging. This study details crayon imaging characteristics on CT and MRI, aiding in identifying these unexpected objects in medical scans.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Pediatric Radiology

Background:

  • A crayon fragment caused a foreign body inflammatory process in a child's masticator space.
  • The unexpected appearance of the crayon on CT and MR imaging prompted further investigation.

Purpose of the Study:

  • To investigate and characterize the imaging appearance of crayons using CT and MRI.
  • To establish imaging features for identifying crayon foreign bodies.

Main Methods:

  • CT and MR images of 22 commercial crayons and 3 non-pigmented crayons were acquired.
  • Crayon CT attenuation and MRI susceptibility signal dropout diameter were analyzed.
  • Data were plotted against crayon brand and color.

Main Results:

  • All crayons exhibited a central hypo-attenuating tract on CT.
  • Crayon attenuation varied significantly by brand and color.
  • A consistent signal void on T1/T2 and signal dropout on susceptibility-weighted imaging was observed, with variable diameters.

Conclusions:

  • Understanding crayon imaging features is crucial for accurate identification.
  • This knowledge can aid in diagnosing unusual foreign body cases involving crayons.