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  • Title: [Short-tau inversion-recovery (STIR) sequence magnetic resonance imaging evaluation of orbital structures in Graves' orbitopathy].
    Author: Rodríguez-González N, Pérez-Rico C, López-Para Giménez R, Arévalo-Serrano J, Del Amo García B, Calzada Domingo L, Flores Ruiz L, Blanco R.
    Journal: Arch Soc Esp Oftalmol; 2011 Nov; 86(11):351-7. PubMed ID: 22040641.
    Abstract:
    OBJECTIVE: To evaluate the orbital structures and to establish correlations with disease activity and severity in patients with Graves' hyperthyroidism and orbitopathy (GO) using short-tau inversion-recovery (STIR) sequence magnetic resonance imaging (MRI). METHODS: Observational, cross-sectional, case-control study. Twenty-eight patients with euthyroid status after treatment and GO (GO group) and 15 control subjects (control group) were included. Patients underwent a complete ophthalmologic examination and were then assessed according to the EUGOGO (European Group on Graves' Orbitopathy) recommendations. Muscle cross-sectional areas, orbital tissue volumes and the signal intensity ratio (SIR) from the most inflamed extraocular muscle were calculated using a STIR-T2 weighted sequence MRI. Correlations between clinical and MRI measurements were analyzed. RESULTS: Enlargements in the cross-sectional areas and volumes were significant for most EOMs (P<.001), but not for the lateral rectus muscle cross-sectional area. A significant difference in SIR values between patients with GO and control subjects (P<.001) was found. No significant correlations were found between muscle cross-sectional areas, orbital tissue volumes, SIR values and the clinical activity parameters. CONCLUSIONS: Given the small sample size of our study, with the obvious need for larger clinical trials, we were unable to demonstrate that the STIR sequences in MRI are a sensitive tool in assessing patients with longstanding GO in order to detect inflammatory changes and activity follow-up, possibly because it is in inactive phase. Meanwhile, it is still necessary to continue performing a thorough clinical evaluation in the therapeutic management of GO.
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