Orbital pseudotumors: value of short inversion time inversion-recovery MR imaging.

Abstract

PURPOSE:

To evaluate magnetic resonance (MR) signal intensities of orbital pseudotumors on short inversion time inversion-recovery (STIR) images and to predict the effect of treatment.

MATERIALS AND METHODS:

Sequential MR examinations were performed in 17 patients with orbital pseudotumors, before and after treatment. All patients underwent MR imaging with T1- and T2-weighted spin-echo or fast spin-echo sequences, and STIR sequences with two 0.5-T systems. Quantitatively and qualitatively, the differences in signal intensities among three therapeutic response groups (good, mild, and no responses) were analyzed for each pulse sequence.

RESULTS:

Quantitatively, both contrast and contrast-to-noise ratio on STIR images corresponded well to the results of response to therapy for all background markers; contrast and contrast-to-noise ratio values in the good response group were the largest, while those in the no response group were the smallest (P < .0001). Qualitatively, the signal intensities of the lesions in the good response group were interpreted as hyperintense to the cerebral cortex in 14 (93%) or 11 (73%) of 15 lesions by two observers, respectively, while in the no response group, both observers assessed 16 (89%) of 18 lesions as hypo- or isointense to the muscle (P < .0001).

CONCLUSION:

STIR images showed a variety of signal intensities in the lesions, and the signal intensities on the STIR images helped predict the response to the therapy in orbital pseudotumors.

• Authors: C Asao, Y Korogi, A Hotta, O Shimomura, M Kitajima, A Negi, M Takahashi
• Journal: Radiology (Radiology) Vol. 202 Issue 1 Pg. 55-9 (Jan 1997) ISSN: 0033-8419 [Print] United States
• PMID: 8988192 (Publication Type: Journal Article)

Topics

• Adult
• Aged
• Female
• Humans
• Magnetic Resonance Imaging (methods)
• Male
• Middle Aged
• Orbital Pseudotumor (diagnosis)