The course of the main lobar fissure is described as what?

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The main lobar fissure is a shallow groove on the visceral surface of the liver that connects the fissure for the ligamentum teres hepatis with the fossa of the gallbladder. Its course is not fixed; it can be short and its direction can vary between individuals. That makes “short and variable” the best description. It’s not a long, unchanging cleft, and while it helps orient the liver on ultrasound, its length can differ from person to person, hence the variability.