• Susie Kang, Erika Imura, Yoo-Jin Kim, Shin Ae Yoon, Ji Hyuk Lee, and Jin-Woo Park.
• Department of Pediatrics, Chungbuk National University Hospital, Chungbuk National University College of Medicine, Cheongju, Korea.
• Medicine (Baltimore). 2022 May 20; 101 (20): e29187e29187.

RationaleA patent urachus is a rare congenital anomaly that atypically presents as an umbilical cord cyst or large umbilical cord. Here we describe a case of a giant umbilical cord cyst in a newborn diagnosed as a patent urachus.Patient ConcernsA male infant with a birth weight of 3260 g was transferred because of an antenatally diagnosed giant umbilical cord cyst accompanied by yellowish discharge and granulation in the umbilical cord after birth.DiagnosesPatent urachus.IntervensionsThe patent urachus was treated by excision of the urachal remnant followed by partial cystectomy.OutcomesPostoperative orchitis with pyocele occurred and was treated with a course of antimicrobial therapy; and no other complications developed.LessonsNewborns with a giant umbilical cord or umbilical cord cysts should be examined for possible accompanying urachal anomalies, even if antenatal ultrasound shows no other suspicious findings, to prevent delayed diagnosis and subsequent complications.Copyright © 2022 the Author(s). Published by Wolters Kluwer Health, Inc.

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