Pulmonary cement embolism

Pulmonary cement embolism refers to embolisation of polymethyl methacrylate (PMMA) into the lungs. PMMA is a rapidly settling acrylic cement that is often used in vertebroplasty.

Its reported incidence is thought to be around 4.6-26% of patients having percutaneous vertebroplasty or kyphoplasty 6,9,11,15

Patient's are often asymptomatic 6,12 and it may be detected incidentally for imaging done for another reason.

Most leakages are thought to be caused by the injection of polymethylmethacrylate (PMMA) that is still too liquid or by applying too much pressure while injecting the material 13. Other predisposing factors include the needle position with respect to the basivertebral vein and overfilling of the vertebral body 15.

A one year CT follow up study in those with known cement embolism however showed no evidence of any pulmonary reaction or complication 14.

Plain film - chest radiograph

Due to its extreme radio-density, cement emboli may be detected on plain film may show multiple radiographically dense opacities with a tubular and branching shape that were scattered sporadically or distributed diffusely throughout the lungs 6. For accurate appreciation of embolic distribution, cross sectional imaging is required. 

CT chest

PMMA is extremely high attenuating on CT and due to this reason PMMA-emboli are better detected on a non contrast or portal venous phased study compared with a CTPA.

CT may also show extruded cement within the epidural veins, cardiac chambers or other parts of the venous system.

Reported management options vary, ranging from observation to anticoagulation to embolectomy.

Complications

A recognised concurrent complication to look for is cardiac perforation from cement material lodged in cardiac chambers 10,17,19.

Consider other radiopaque embolic events such as N-butyl-2-cyanoacrylate pulmonary embolism.

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Article Information

rID: 22701
System: Chest
Synonyms or Alternate Spellings:
  • Acrylic cement embolism
  • Cement embolism to the lungs
  • Cement embolism to lung
  • Polymethylmethacrylate (PMMA) embolism into lungs
  • Polymethylmethacrylate embolism to lung
  • Pulmonary polymethylmethacrylate embolism
  • Pulmonary polymethylmethacrylate emboli
  • Pulmonary cement emboli
  • Cement pulmonary embolism
  • Cement pulmonary emboli
  • Acrylic cement embolism to lung

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