Snowstorm sign (complete hydatiform mole)

Snowstorm sign in obstetric imaging is classically seen in complete hydatiform mole. It is characterised by the presence of many hydropic villi which gives the ultrasonographic appearance of a central heterogeneous mass having a solid, hyperechoic area and interspersed with a multitude of cystic areas and filling the entire uterine cavity. 

A similar sign has also been described in extracapsular breast implant ruptures.

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Article information

rID: 37546
System: Obstetrics
Section: Signs
Synonyms or Alternate Spellings:
  • Snowstorm appearance: complete hydatiform mole
  • Granular appearance: complete hydatiform mole
  • Snow storm appearance: complete hydatiform mole
  • Snow storm sign: complete hydatiform mole

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