When should we suspect a malignant liver mass?

• A. Hypoechoic ring, irregular shape, the mass is heterogenous, there is accompanying ascites, or when the mass invades nearby structures
• B. A well-defined, smooth, homogeneous mass
• C. A simple cyst with posterior enhancement
• D. A tiny anechoic lesion without vascularity

Answer: (C)

Recognizing malignant liver masses on ultrasound relies on noticing invasion and disruption of normal architecture rather than clean, simple-appearing lesions. Features that raise suspicion include irregular shape or margins, heterogeneous internal echo texture, and evidence of invasion into nearby structures or vessels. Ascites can accompany malignant disease, and vascular invasion (tumor extending into hepatic or portal veins) is a strong red flag.

In contrast, benign patterns are typically seen as well-defined, smooth borders with uniform, homogeneous echotexture; a simple cyst appears entirely anechoic with posterior acoustic enhancement; and a tiny anechoic lesion lacking internal vascularity is most consistent with a benign cyst. So the malignant pattern is characterized by irregularity, heterogeneity, and signs of invasion or extrahepatic spread, whereas the benign patterns show orderly, simple, and nonvascular characteristics.