What is the most common benign mass of the liver?

Prepare for Liver Disease and Tumors Test with tailored flashcards and questions. Get detailed explanations and improve your knowledge. Ace the medical student exam!

Cavernous hemangioma, a vascular malformation of dilated blood vessels, is the most common benign mass in the liver. These lesions are usually found incidentally in adults and are typically asymptomatic, though very large ones can cause fullness or mild discomfort. Imaging is characteristic and helps distinguish it from other liver lesions: on ultrasound they’re usually well defined and quite echogenic; on contrast-enhanced CT or MRI they display peripheral nodular enhancement in the arterial phase with gradual, centripetal filling on delayed phases, and MRI often shows very high signal on T2 because of the fluid-filled vascular spaces. Because these tumors are benign and rarely cause problems, the usual approach is observation unless they cause symptoms, grow rapidly, or there’s diagnostic uncertainty where intervention might be considered. In contrast, hepatic adenoma and focal nodular hyperplasia are other benign lesions but have different associations and imaging features, while hepatocellular carcinoma is malignant and linked to risk factors like cirrhosis or hepatitis infections.