What is the shape of the upper surface of the left lobe?

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The upper (diaphragmatic) surface of the left lobe is convex and molded onto the diaphragm. The liver’s diaphragmatic surface sits directly against the curved dome of the diaphragmatic cavity, so it follows that dome’s contour and presents a smooth, outwardly rounded (convex) surface. This is in contrast to the irregular, underside (visceral) surface, which has grooves and impressions from the stomach and other organs. So the best description is a convex surface that is molded to the shape of the diaphragm.