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Year : 2019  |  Volume : 16  |  Issue : 3  |  Page : 137-139

Extensive squamous metaplasia in papillary carcinoma of the thyroid: A potential diagnostic pitfall

Department of Pathology, Tata Memorial Hospital, Mumbai, Maharashtra, India

Correspondence Address:
Dr. Rajiv Kumar
Department of Pathology, Tata Memorial Hospital, Ernest Borges Marg, Parel, Mumbai - 400 012, Maharashtra
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/trp.trp_2_19

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It is a rare event to find squamous cells in the thyroid gland. Squamous metaplasia (SM) of the thyroid follicular epithelium is one of such conditions. SM can occur in association with nonneoplastic as well as neoplastic thyroid lesions. Here, we report a case of papillary carcinoma of the thyroid in a 26-year-old female showing extensive SM. On immunohistochemistry, squamous as well as papillary carcinoma component expresses CK7 and thyroglobulin. High molecular weight cytokeratin and p63 were positive in only in the squamous area, while TTF-1 was negative in these cells. Extensive SM in the thyroid can be misinterpreted as primary or metastatic squamous cell carcinoma. Further, the tumor may be mislabeled as collision tumors of thyroid. As it might lead to therapeutic implications, the distinction of SM in thyroid is necessary.

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