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Glass foreign bodies

Dr Daniel J Bell and Dr Henry Knipe et al.

Glass foreign bodies may be present if they are ingested, inserted, or as a result of an injury. All glass is radiopaque 7.

Epidemiology

The prevalence of glass foreign bodies in wounds from injury has been recorded at a rate of 1.5% in superficial (subcutaneous) wounds and 7.5% of deeper wounds 1

Radiographic features

Plain radiograph

Only ~10% of x-rays ordered for investigation of retained foreign bodies are positive (reflecting the low incidence post-injury), but x-rays are excellent at detecting radiopaque foreign bodies with ~85% being detected 6:

  • glass is always radiopaque, independent of lead content or other additives, with the caveat that tiny pieces may be too small to actually be resolved (see below) 7,8
  • should be visible on plain films if larger than 2 mm 2,5
CT

All glass is visible on CT and usually easier to see than on plain radiography 9.

Ultrasound
  • can be used to localize foreign bodies further and define the relationship with soft tissue structures and assess for further injuries
  • appears hyperechoic with posterior shadowing and often demonstrates reverberation artifact
  • if present for >24 hours may demonstrate a hypoechoic ring 3,4
MRI

MRI would clearly not be the first choice investigation for detecting foreign bodies, including glass. Nevertheless, on MRI all forms of glass are seen but on most sequences considerable artifact is present 9.

Article information

rID: 25250
Synonyms or Alternate Spellings:
  • Glass injury
  • Glass foreign body
  • Glass foreign bodies
  • Glass injuries

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Cases and figures

  • Case 1: x-ray
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  • Case 2: ultrasound
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  • Case 3: MRI
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  • Case 4: with skin marker
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  • Case 5: glass in the wrist
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  • Case 6: ultrasound
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  • Case 7 : ultrasound
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  • Case 8: x-ray
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  • Case 9
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  • Case 10
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  • Case 11
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  • Case 12
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  • Case 13: glass shards in foot
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