Hemihypertrophy, now more commonly referred to as hemihyperplasia in the medical literature, is a condition in which one side of the body or a part of one side of the body is larger than the other to an extent considered greater than the normal variation. As establishing a set of clinical criteria for diagnosis of hemihyperplasia is difficult, the dictum is often used that the clinician should be able to see the asymmetry "from the end of the bed".Hemihyperplasia is seen in several congenital syndromes including Beckwith-Wiedemann syndrome and Russell-Silver syndrome.Hemihyperplasia is a congenital overgrowth disorder, and the asymmetry can range from mild to severe. [Source: Wikipedia ]