Table 1.

Malignancies Showing Squamous Differentiation in the Thyroid.

		n (%)
Primary (n = 111)	Papillary carcinoma	84 (34%)
	Unspecified	32 (13%)
	Diffuse sclerosing	20 (8%)
	Classic/conventional	19 (8%)
	Follicular variant	7 (3%)
	With high-grade features	1 (<1%)
	Tall cell	1 (<1%)
	Columnar cell	1 (<1%)
	Oncocytic	1 (<1%)
	Anaplastic thyroid carcinoma	21 (9%)
	Follicular carcinoma	3 (<1%)
	Poorly differentiated carcinoma	2 (<1%)
	Mucoepidermoid carcinoma	1 (<1%)
	Medullary carcinoma	1 (<1%)
	Intrathyroid thymic carcinoma	1 (<1%)
Secondary (n = 116)
	Larynx	73 (30%)
	Pharynx	13 (5%)
	Tongue	10 (4%)
	Trachea	8 (3%)
	Esophagus	5 (2%)
	Lung	3 (<1%)
	Tonsil	1 (<1%)
	Lip	1 (<1%)
	Vulva	1 (<1%)
	Prostate	1 (<1%)
Uncertain (n = 16)	Squamous cell carcinoma	16 (8%)
Total		243