The borders of the solid part of the malignant nodule is uneven, lobulated. As we mentioned earlier the presence of microcalcifications within the tip of a spiculated solid part has limited relevance in the differential diagnostic. Let's analyze the solid part of the papillary carcinoma. Although it presents a lower echogenicity compared with the normal parenchyma, the solid part in fact has a normal echogenicity while the normal parenchyma is hyperechogenic because of the posterior acoustic enhancement. Although the surface of the solid part of the benign lesions is also lobulated but in contrast with papillary carcinoma it is sharp and even.