Conclusion: This is a rare case of multiple RCCC metastases within an adenomatous nodule in goiter. Clinical diagnosis of RCCC metastases to thyroid is extremely difficult, even more if metastases grow in multinodular goiter. It should be always suspected in patients with a clinical history of RCCC. Objective: Follicular carcinoma, oncocytic variant, is a rare type of thyroid carcinoma. We examined a case of oncocytic carcinoma misdiagnosed as medullary carcinoma on fineneedle aspiration (FNA) because it was associated with amyloid material. Method: A 73-year-old female rheumatoid arthritis (RA) patient had a 4.0 cm mass in the right lobe of her thyroid, which showed no enhancement effect on CT scan and was diagnosed as a "cyst". FNA was performed, and she subsequently died of unrelated causes. An autopsy was performed.