“…Lobulated shape in pleomorphic adenomas and anechoic areas in Warthin tumors, although common, are not pathognomonic and may be found in many other lesions, including malignancies (73,74) (Fig 25). For example, macroscopic cystic structures, which appear as anechoic areas at US, may occur in other benign tumors (pleomorphic adenoma, basal cell adenoma), in malignant tumors (mucoepidermoid carcinoma, acinic cell carcinoma), and in an abscessed or necrotic metastatic node; in addition, benign lymphoepithelial lesions in HIV-positive patients may have the appearance of solid-cystic nodules (Fig 25) (3,35,72,74,82-86).…”