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Lori J. Dobson, Carol E. Barnewolt, Donna Morash, Susan A. Connolly and Judy A. Estroff Human fetal sacrococcygeal extension or ‘tail’ in the second trimester: prenatal diagnosis, associated findings, and clinical outcome Prenatal Diagnosis 33

Version of Record online: 17 DEC 2012 | DOI: 10.1002/pd.4021

What's already known about this topic?

  • Fetal sacral extensions or ‘tails’ are rare, but have been described by sonography over the last 20 years.
  • Such lesions can be seen in isolation or with associated spinal abnormalities, additional congenital anomalies or underlying genetic syndromes.

what does this study add?

  • When a fetal sacrococcygeal extension is seen on sonography, it is important to screen for congenital anomalies, closely monitor fetal growth, and consider obtaining a fetal karyotype.
  • Although sonography initially identified the sacral extensions in this series, fetal MRI aided in the diagnosis of associated anomalies, primarily of the brain and face and in determining the position of the fetal spinal cord conus.
  • In the setting of additional anomalies, IUGR or abnormal umbilical cord Doppler, prenatal counseling should include discussion of potential syndromic etiologies and raise the concern for a more complex prognosis.

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