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Related Experiment Videos

Olfactory neuroblastoma: MR evaluation

C Li1, D M Yousem, R E Hayden

  • 1Department of Otorhinolaryngology and Head and Neck Surgery, Hospital of the University of Pennsylvania, Philadelphia 19104.

AJNR. American Journal of Neuroradiology
|September 1, 1993
PubMed
Summary

Magnetic resonance imaging (MRI) effectively maps olfactory neuroblastoma extent, potentially surpassing CT scans in accuracy. However, MRI signal characteristics can sometimes resemble other tumors, requiring careful interpretation.

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Area of Science:

  • Radiology
  • Oncology
  • Medical Imaging

Background:

  • Olfactory neuroblastoma is a rare malignant tumor originating in the nasal cavity.
  • Accurate diagnosis and staging are crucial for effective treatment planning.

Purpose of the Study:

  • To assess the utility of Magnetic Resonance (MR) imaging in diagnosing and staging olfactory neuroblastoma.
  • To compare the accuracy of MR with Computed Tomography (CT) in evaluating tumor extent.

Main Methods:

  • Retrospective review of five patients with histologically confirmed olfactory neuroblastoma.
  • All patients underwent MR imaging; four also had CT scans.
  • MR findings were correlated with surgical outcomes and staging.

Main Results:

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  • MR accurately delineated tumor extent, aligning with surgical findings in all five patients.
  • Three tumors extended to the anterior skull base; MR identified one such case missed by CT.
  • Tumor signal intensity on T1-weighted images was isointense to hyperintense relative to muscle; T2-weighted signal intensity varied.
  • Minimal to moderate enhancement was observed in all cases.

Conclusions:

  • MR imaging is highly valuable for defining the extent of olfactory neuroblastoma.
  • MR may offer superior accuracy compared to CT for staging this tumor.
  • The overlapping signal intensity characteristics of olfactory neuroblastomas on MR necessitate cautious interpretation.