Uterine contraction in pregnancy

Case contributed by Nasir Siddiqui
Diagnosis certain


G1P0, 11 weeks by dates, with pelvic pain.

Patient Data

Age: 25 years
Gender: Female

Left image: a focal retroplacental mass/bulge that is isoechoic to the uterus. 

Right image: 1 week follow up with resolution of uterine contraction.

Case Discussion

Focal retroplacental mass/bulge that is isoechoic to the uterus. Differential considerations include:


Follow-up was performed to confirm the diagnosis of uterine contraction. Note the resolution of the retroplacental bulge on follow-up imaging.

Doppler assessment is also useful (not shown here):

  • hematoma- there is no Doppler flow
  • uterine contraction- increased RI
  • myoma - little Doppler flow

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