The selection of target areas for orbital imaging, application of diethylenetriaminepentaacetic acid orbital imaging, clinical factors, alkaline phosphatase, and thyrotropin receptor antibodies in the staging and grading of thyroid-associated ophthalmopathy.

PURPOSE

This study aimed to investigate the active phase of thyroid-associated ophthalmopathy (TAO), its correlations with clinical factors, serological tests, and orbital imaging parameters, and evaluate the diagnostic value of different orbital imaging target areas.

METHODS

A total of 45 patients with thyroid-related eye disease underwent imaging, serological tests, and clinical data collection. Clinical Activity Score (CAS) assessment, diplopia scores, and NOSPECS grading were conducted. Radioactive counts of extraocular muscles and tear glands were measured. Computed tomography scans assessed exophthalmos and extraocular muscle thickening. Correlations and differences among study parameters and grades were evaluated using receiver operating characteristic curves.

RESULTS

Active TAO correlated significantly with radioactive counts of muscles and tear glands, alkaline phosphatase (ALP), thyrotropin receptor antibody (TRAb), and age. Significant differences were found among NOSPECS grades for studied variables (except ALP and TRAb). Extraocular muscle thickening was confirmed as a reliable diagnostic criterion. High consistency was found between orbital imaging and CAS staging. Treatment showed varying degrees of improvement in active patients, while nonactive patients showed no progression during follow-up. Receiver operating characteristic curves demonstrated high diagnostic efficacy for tear gland radioactive counts.

CONCLUSION

Tear glands and extraocular muscles have high diagnostic value in TAO, with tear glands showing a higher value. Orbital imaging provides an objective and comprehensive assessment compared with CAS scoring alone. ALP, TRAb, and age also play significant roles in staging.