Early sonographic detection of a 'human tail': A case report

Z. Efrat, T. Perri*, I. Meizner, R. Chen, Z. Ben-Rafael, A. Dekel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


We report on a newborn in whom an echogenic protrusion arising in the caudal region was detected at 12 weeks' gestation. Subsequent ultrasound examinations at weeks 15 and 22 failed to demonstrate this finding. After birth, the infant was found to have a pilonidal sinus. The pilonidal sinus may represent a remnant of the embryonic appendage ('human tail') that usually disappears by the end of the 8th week of gestation. This case might support the theory of congenital pilonidal sinus origin.

Original languageEnglish
Pages (from-to)534-535
Number of pages2
JournalUltrasound in Obstetrics and Gynecology
Issue number5
StatePublished - 2001
Externally publishedYes


  • Human tail
  • Pilonidal sinus
  • Prenatal diagnosis
  • Ultrasound


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