골전이로 확인된 대여포형 갑상선 유두암종

Metastasizing Macrofollicular Variant of Papillary Thyroid Carcinoma to the Pelvic Bone

Macrofollicular variant of papillary thyroid carcinoma (MFV-PTC) is a rare variant of papillary carcinoma. The tumors are easily misdiagnosed as benign due to their macrofollicular structures with bland-looking cytologic findings. The author experienced a rare case of MFV-PTC with pelvic bone metastasis 10 years after initial surgery. The patient was a 55-year-old female with a history of right thyroid lobectomy. The encapsulated nodule consisted of variable sized follicles with no nuclear atypia. The initial diagnosis was a nodular hyperplasia. She had recently suffered from pelvic discomfort due to metastasizing thyroid carcinoma. The thyroid was reevaluated and revised as MFV-PTC.