Hemihypertrophy refers to an asymmetric growth pattern in which one side of the body is larger than the other. It is a rare condition that affects both children and adults. There are a few synonyms for the word hemihypertrophy, such as hemihyperplasia, lateral hypertrophy, asymmetrical overgrowth, and half-sided overgrowth. These terms indicate the same condition in which the affected limb or body part has a larger size than the corresponding one on the other side. In some cases, hemihypertrophy can be a sign of an underlying illness or genetic disorder, which makes it essential to get it diagnosed and treated by a medical professional.