C cell carcinoma of the thyroid--papillary type.

Two cases of papillary type of C cell carcinoma of the thyroid were reported. They showed papillary arrangement with fibrovascular stalk in properly fixed tissues. Histochemically argyrophil reaction was positive in the cytoplasm and amyloid deposited in the stroma. Ultrastructurally secretory granules were found in their cytoplasm. The papillary type is not an artifact but one of the histologic variations of this carcinoma.