These nodules do not present any classical subtype of cysts, the appearance of both cases is closest to spongiform type which rarely proves to be malignant. On the other hand there were two suspicious signs in the event of papillary carcinoma. First, the presence of microcalcification and second the lobulated margin of the nodule. The presence of fluid deeply alters the basic echogenicity of a nodule, it increases the echogenicity of the solid part. At first sight the papillary carcinoma seems to be hypoechogenic, but it is caused only by the presence of fluid. Compare the echogenicity of the solid part of the nodule with that of the non-nodular thyroid - these are identically echonormal.