Abstract
To describe an uncommon initial manifestation of well-differentiated follicular carcinoma of the thyroid in an unusual metastatic site. We present clinical, laboratory, and imaging findings in our patient and review related data from the literature. A young healthy woman presented with headache and diplopia. Magnetic resonance imaging of the brain showed a complex mass in the sellar region. Endocrine evaluation was remarkable only for a modestly high serum prolactin level. Transsphenoidal biopsy of the sellar mass revealed metastatic follicular thyroid carcinoma. On subsequent examination, a thyroid nodule was palpated. She underwent total thyroidectomy and ablative therapy with 131I, after which her symptoms gradually subsided and the sellar mass ultimately decreased in size. Although well-differentiated thyroid cancer generally manifests as a thyroid nodule, metastatic disease is present at the time of initial assessment in approximately 1% of cases, and the lungs and the skeleton are the most frequent sites of involvement. Only a few cases of thyroid cancer metastasizing to the sella have been reported. Described cases occurred mainly in elderly patients with previously diagnosed thyroid cancer. The most common malignant tum...Continue Reading
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