The Use of Radiotherapy for the Treatment of Localized Orbital Amyloidosis

Objective: To describe two patients with localized orbital amyloidosis and the response of their condition to surgical debulking followed by external beam radiotherapy. Design: Retrospective noncomparative interventional case series. Outcome measures: Stabilization or regression of orbital signs after treatment. Methods: Patients with biopsy-proven diagnosis of localized progressive orbital amyloidosis received 34 and 30 Gy fractionated external beam radiotherapy. The clinical case notes and histopathology for the two patients were reviewed. Results: A 69-year-old man with orbital amyloid deposition in association with localized MALT lymphoma had a marked improvement in orbital signs following surgical debulking and radiotherapy, with no recurrence over two years. A 59-year-old woman with localized orbital amyloidosis showed regression of disease after surgical debulking and radiotherapy, with no evidence of recurrence after six years of follow-up. Conclusion: External beam radiotherapy following surgical debulking appears to halt the progression of localized orbital amyloidosis. Radiotherapy may be used in conjunction with surgical debulking of disease.