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Squamoid

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Squa´moid    (skwā´moid)
a.1.Resembling a scale; also, covered with scales; scaly.


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The final histologic diagnosis was a poorly differentiated thyroid carcinoma with squamoid features and a minor component of conventional papillary carcinoma.
The relationship of the WHO classification and previous histologic classifications is as follows: type A corresponds to spindle cell type or medullary type thymoma; AB corresponds to mixed type; B1 corresponds to lymphocyte-rich type, lymphocytic type, predominantly cortical type, or organoid type; B2 corresponds to cortical type; B3 corresponds to epithelial type, squamoid type, or atypical thymoma, or well-differentiated thymic carcinoma; and type C corresponds to thymic carcinoma.
Some grade 3 invasive ductal carcinomas showed unusual features, including several cases with comedo-type necrosis (Figure 1) and single cases with squamoid differentiation (Figure 2), spindle cell differentiation (Figure 3), an abundance of tumor giant cells (Figure 4), and a ringlike appearance with extensive central necrosis and fibrosis (Figure 5).
 
 
 
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