An exceptionally rare case of metastatic osteoclast-like giant cell-rich variant of anaplastic thyroid carcinoma: A diagnostic challenge.

Osteoclast-like giant cell-rich variant of anaplastic thyroid carcinoma is extremely uncommon. In this paper we describe one such case in a 50 year-old male. The patient presented with enlarged cervical lymph node after initial total thyroidectomy. The fine needle aspiration cytology (FNAC) smear showed abundant multinucleated osteoclastic-like giant cells and scattered large bizarre tumour cells. FNAC of such cases may often be mistaken as osteoclast-like giant cell-rich lesions.