Symmetrical intrauterine growth restriction

Symmetrical intrauterine growth restriction is a type of intrauterine growth restriction (IUGR) where all fetal biometric parameters tend to be less than expected (below the 10th percentile) for the given gestational age. Both length and weight parameters are reduced.

Please, refer to the article on asymmetrical intrauterine growth restriction for a particular discussion of this other type of IUGR. 

As a general rule, fetuses with this type of IUGR pattern may present at an earlier stage in gestation compared with the asymmetrical IUGR pattern.

  • aneuploidic syndromes
  • infections, e.g. TORCH 7
  • other
    • topical use of maternal fluorinated glucocorticoid (rare) 3
    • external agents, e.g. nicotine, alcohol, heroin, ionizing radiation 7

All sonographic biometric parameters tend to be symmetrically reduced. Therefore, fetuses have normal or near normal:

Differential considerations on ultrasound assessment include:

  • incorrect dates
  • lower end of normal variation, i.e. if parents are small
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Article information

rID: 13488
System: Obstetrics
Tag: cases
Synonyms or Alternate Spellings:
  • Symmetrical IUGR
  • Reduced growth potential IUGR
  • Symmetric intrauterine growth restriction
  • Symmetric IUGR
  • Type I IUGR
  • Proportional intrauterine growth restriction
  • Proportional intra-uterine growth restriction
  • Proportional IUGR
  • Symmetrical intra-uterine growth restriction
  • Type 1 IUGR
  • Type one IUGR
  • Type I intrauterine growth restriction
  • Type 1 intrauterine growth restriction
  • Type one intrauterine growth restriction

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Cases and figures

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