Gigantomastia (also known as macromastia or mammomegaly) is the term employed when there is massive breast enlargement. It is often associated with pregnancy. It may be rarely unilateral.

Gigantomastia is a very common condition characterized by proliferation of either breast fatty tissue or glandular tissue or both, resulting in rapid increase in breast size over a rather short period of time.

It may be seen in about one of every 100,000 pregnancies.

Its exact etiology is unknown however it is believed to be due to an abnormal response to pregnancy-related hormonal stimulation. Significant enlargement of the breasts may cause tissue necrosis, ulceration, infection and hemorrhage, which may be life-threatening. The diagnosis is based on the clinical findings and in normal circumstances radiologic studies are required only if there is an underlying disorder.

It can occur with peripubertal breast hypertrophy, juvenile gigantomastia, obesity-related breast hypertrophy or as a complication secondary to pregnancy-related gland hypertrophy. Some authors believe macromastia to be associated with an increased risk of malignancy.

Medical treatment is with bromocriptine administration; however surgical intervention may be required if the disorder continues to progress. The usual surgical management involves reduction mammoplasty. The resected specimen is sent for histological evaluation to exclude malignancy.

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Article information

rID: 25998
Synonyms or Alternate Spellings:
  • Massive breast enlargement
  • Breast hypertrophy
  • Macromastia
  • Mammomegaly

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