What is the term for the extension of the right lobe of the liver inferior and anterior to the right kidney?

The correct term for the extension of the right lobe of the liver inferior and anterior to the right kidney is Reidel's lobe. This anatomical variant occurs in some individuals and is characterized by a tongue-like projection of the liver that extends down into the right abdominal cavity. Reidel's lobe can be significant during imaging as it may be mistaken for other masses or pathological conditions, emphasizing the importance of understanding liver anatomy variations in sonography practice.

The caudate lobe is a separate part of the liver located on its posterior surface and has its own distinct blood supply and drainage. An accessory lobe refers to additional liver tissue that may be present but is typically not localized in the described area. A pyramidal lobe is related to the thyroid gland and not the liver, further distinguishing it from the context of the question. Understanding these anatomical details is crucial for accurate imaging and diagnosis in sonography.