On a liver ultrasound, what does echogenic nodules mean? & what does avascular mean? my paper also say they have the appeance of a small haemangiomata

Benign: Echogenic nodules are a common appearance of a liver hemangioma. This is a very common, benign tumor of the liver usually found incidentally when evaluating a patient for various disorders. Avascular means they do not have a very robust blood supply, which is usually the case. Sometimes they can grow quite large, and mimic other tumors. When large, there is also a slightly greater risk of rupture.