Last revised by Jeremy Jones on 17 Oct 2019

Hemihyperplasia, also known as hemihypertrophy, is asymmetry in size between the right and left of the body, more than can be attributed to normal variation.

Hemihyperplasia is more scientifically correct than hemihypertrophy as the cells are hyperplastic rather than hypertrophied 1

Incidence is estimated at 1 in ~50,000 live births 2,4

Hemihyperplasia can arise sporadically as isolated hemihyperplasia, or it can arise as part of a syndrome 2-4:

Increased risk (5% of patients) of malignancy, most commonly Wilms tumors 2

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