The Utility of Immunohistochemistry in Differentiating Metastatic Primary Squamous Cell Carcinoma of the Thyroid from a Primary Lung Squamous Cell Carcinoma
Primary squamous cell carcinoma of the thyroid gland (PSCCTh) and anaplastic thyroid Guitar Strings carcinoma with extensive squamous differentiation are rare entities which pose a diagnostic challenge in determining the primary site when presented as metastases.The difficulty in confirming a thyroid primary is further compounded by the aggressive