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Inverted papilloma: evaluation with MR imaging
D M Yousem1, D W Fellows, D W Kennedy
1Department of Radiology, Hospital of the University of Pennsylvania, Philadelphia 19104.
Radiology
|November 1, 1992
Summary
Magnetic resonance (MR) imaging cannot reliably distinguish benign inverted papillomas from malignant sinonasal tumors. While MR helps define lesion extent, it lacks a signature appearance for differentiating these conditions.
Area of Science:
- Radiology
- Oncology
- Otolaryngology
Background:
- Inverted papillomas are benign sinonasal tumors that can mimic malignancies.
- Accurate differentiation is crucial for appropriate patient management.
Purpose of the Study:
- To evaluate the magnetic resonance (MR) imaging characteristics of inverted papillomas.
- To determine if MR can differentiate inverted papillomas from sinonasal malignancies.
Main Methods:
- Retrospective review of MR images from 10 patients with inverted papilloma.
- Analysis of signal intensity on various sequences (short TR, long TR/TE, long TR/short TE).
- Assessment of enhancement patterns after gadolinium administration.
Main Results:
- Inverted papillomas showed consistent signal intensities: iso- to hyperintense to muscle on short TR, intermediate on long TR/TE, and iso- to hypointense to fat on long TR/short TE.
- All enhancing papillomas demonstrated solid, inhomogeneous enhancement.
- No distinctive MR signal or enhancement patterns differentiated papillomas from eight reviewed malignancies.
Conclusions:
- There is no specific MR imaging signature for inverted papilloma.
- MR imaging is primarily useful for defining the extent of sinonasal lesions, not for differentiating benign from malignant types.