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Abstract
Radiation-induced malignancy is rare, occurring in approximately 0.4%-1.0% of patients receiving external beam radiation therapy. Sarcomas and squamous cell carcinomas are among the most common types of cancers to occur. A 74-year-old woman presented with redness and swelling in the right periorbital region. She had history of multiple recurrent ameloblastoma of the right maxilla, invading the right orbital floor status post 4 surgical resections and 66 Gray external beam radiotherapy 5 years prior. MRI showed a poorly circumscribed mass involving the inferior and lateral orbit. Orbital biopsy revealed clear cell carcinoma with hyalinizing sclerosis and Ewing sarcoma breakpoint region 1 gene arrangement. Due to the extent of orbital disease and presence of perineural invasion, she underwent orbital exenteration. Hyalinizing clear cell carcinoma, a rare cancer, has not been reported to occur in the orbit following radiation. This case highlights the importance of lifetime monitoring in patients who have undergone radiation therapy.
View details for DOI 10.1097/IOP.0000000000001708
View details for PubMedID 32427738