Abstract
Renal Clear Cell Carcinoma (RCC) comprises over 80% of renal malignancies in adults. Thyroid gland metastasis is rare in RCC. Few studies have described cases of RCC mistaken for benign arteriovenous malformation (AVM). To the best of our knowledge, an AVM arising from underlying RCC metastasis to the brain has not yet been reported. The current study presents a case of RCC metastasis to the thyroid gland, with an AVM identified to be a result of metastatic involvement in the brain. A 45-year-old African-American female presented with left-sided weakness, slurred speech, facial droop and seizure. The patient's medical history was notable for a diagnosis of RCC, 2010 American Joint Committee on Cancer Tumor-Node-Metastasis Stage 1B (T1B, N0, M0) grade III status post-right partial nephrectomy. Computed tomography (CT) imaging revealed a soft-tissue mass, suspected to be metastasis, in the left lobe of the thyroid, in addition to a 1.9 cm right intracranial mass in the parietal lobe. Positron emission tomography/computed tomography revealed a hypermetabolic area in the thyroid. Fine needle aspiration of the thyroid, and subsequent histopathological analysis, suggested a diagnosis of RCC metastasis. Subsequent immunohistochemical ...Continue Reading
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