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Related Experiment Videos

Changes in paranasal sinus abnormalities found incidentally on MRI

P V Maly1, P C Sundgren

  • 1Department of Radiology, University of Michigan Hospitals, Ann Arbor, USA.

Neuroradiology
|August 1, 1995
PubMed
Summary

Brain MRI scans reveal frequent paranasal sinus abnormalities in adults. Many sinus opacifications resolve or change over time, but polyps and cysts typically persist.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Otolaryngology

Background:

  • Paranasal sinus abnormalities are common incidental findings on brain MRI.
  • Understanding the natural history of these findings is crucial for accurate interpretation.

Purpose of the Study:

  • To investigate the prevalence and evolution of paranasal sinus abnormalities detected during serial brain MRI examinations.
  • To characterize the types of sinus abnormalities and their changes over time.

Main Methods:

  • Retrospective analysis of 178 adult patients undergoing two brain MRIs at least 4 months apart.
  • Systematic evaluation of paranasal sinus opacification, including location, extent, and changes between scans.

Main Results:

  • Sinus abnormality was found in 44% of patients, frequently involving multiple or bilateral sinuses.
  • The maxillary and ethmoid sinuses were most commonly affected.
  • 52% of abnormalities showed interval changes (resolution or new occurrence), with complete opacification and fluid levels being most dynamic.
  • Polypoid abnormalities (polyps, mucosal cysts) did not decrease in severity over time.

Conclusions:

  • Paranasal sinus opacification is a frequent finding on serial brain MRI, often demonstrating dynamic changes.
  • While many abnormalities resolve, persistent or evolving changes warrant further investigation.
  • The stability of polypoid abnormalities suggests a different underlying pathology compared to transient opacifications.

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