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

Share article

Article information

rID: 42988
Section: Syndromes
Synonyms or Alternate Spellings:
  • Hemihypertrophy
  • Isolated hemihyperplasia

Support Radiopaedia and see fewer ads

Cases and figures

  • Case 1: with Beckwith-Wiedemann syndrome
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.