Supervoltage radiotherapy for Graves' ophthalmopathy: CCABC technique and results.

A treatment technique employing retrobulbar supervoltage radiotherapy (XRT) in Graves' ophthalmopathy is described. Twenty-eight patients have been treated and followed between 1980-1983. Twenty-six of 28 patients (93%) showed some response, with 19/28 (68%) having a good to excellent response. Four of 28 (14%) had recurrent symptoms post-XRT. Soft tissue signs and symptoms were relieved and disease progression arrested in the majority of patients, but proptosis and ophthalmoplegia responded poorly. High dose corticosteroids have generally been the alternative form of therapy for this disease. Post-XRT, 24/28 (86%) of patients have had no further steroid requirements, and been spared the associated complications. Treatment was well tolerated, with only five patients (18%) demonstrating a transient worsening of symptoms which settled entirely within 2 weeks. No long-term complications have been encountered. Eleven patients had post-XRT CT scans which were compared to pre-treatment scans and clinical response. Nine of 11 patients (82%) had CT changes in general agreement with the observed clinical response, but the degree of involvement seen on the initial CT scan was not predictive of response nor the risk of relapse. XRT with the described technique is felt to be an effective, safe, and practical approach to the disabling and disfiguring complications of severe Graves' ophthalmopathy.