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Choroidal and orbital metastases from thyroid cancer
Bešić, Nikola ; Lužnik Marzidovšek, Zala
Background: Metastases of thyroid carcinomas to the choroid and/or orbit are infrequent. PubMed was searched for English-language articles and case reports published from 1977 to 2012. In our survey, ...we looked for reports of orbital and/or ocular metastases from the thyroid and found 31 reported cases from 1979 to 2012. Summary: At the time of onset of ocular symptoms, the vast majority of patients had a long history of thyroid malignancy and evidence of widely disseminated metastatic disease. The age of the reported patients ranged from 29 to 83 years. Among the 22 reported cases of thyroid carcinomas with metastases to the choroid from 1979 to 2012, the most common primary tumor was papillary thyroid carcinoma (PTC); this occurred in seven patients. This was followed by medullary thyroid carcinoma in six cases and follicular thyroid carcinoma (FTC) in five cases. Orbital metastases were reported in nine patients with thyroid carcinomas (PTC=4, FTC=3, Hürthle cell=1, not specified=1). Patients with choroidal metastases presented with decreased or blurred vision, eye pain, and flashes in 81%, 5%, and 5% of cases, respectively. The diagnosis of a choroidal tumor was usually based on noninvasive diagnostic techniques such as ultrasonography, transillumination, computer tomography (CT), and/or magnetic resonance imaging (MRI) scanning. (131)I scanning revealed uptake in the orbit in 26% of cases with choroidal and/or orbital PTC or FTC. For a metastasis that causes a definitive loss of vision and/or persistent pain, the treatment of choice was enucleation. The other treatment options were brachyradiotherapy using (125)I episcleral radioactive plaque insertion, external beam radiation, (131)I therapy, chemotherapy, and/or targeted therapy with small molecules. Conclusions: The orbit and globe are not common sites for metastatic thyroid carcinomas. Diagnosis of a choroidal tumor is usually based on clinical judgment and results of noninvasive diagnostic techniques such as ultrasonography, transillumination, CT, and/or MRI scanning. Fundoscopic examination and ocular ultrasonography by an ophthalmologist are recommended for identification and monitoring of choroidal metastatic deposits.
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