Prenatal causes of an allantoic cyst with a patent urachus

Prenatal diagnosis of an allantoic cyst with a patent urachus is rare. A urological etiology can sometimes be associated with it. We report 4 cases of allantoic cyst with a patent urachus and reviewed the literature to investigate for any etiology using the keywords “allantoic cyst” and “patent urachus”. Diagnosis of an allantoic cyst with a patent urachus was established during the first or second trimester of pregnancy. In two cases, rupture of prenatal cysts occurred and in one case, we described a prenatal vesicourethral abnormality. Surgery was performed with good results and no complications. A literature review collected 12 studies (15 fetuses) with a sex ratio of 3 boys/1 girl. The cysts ruptured in 2/3 of the cases, and in half of the cases, urinary abnormalities were found before birth (enlarged bladder, bladder prolapse). At birth, one boy had posterior urethral valve (PUV) and 4 boys had a bladder prolapse. The postoperative course was uneventful. We present our series with one case showing the etiology of a patent urachus during prenatal life. Cystoscopy seems to be valuable in the post-natal diagnosis. In the literature, we found one case of PUV. Surgery was performed with good results and no complications


1Bunch PT, Kline-Fath BM, Imhoff SC, Calvo-Garcia MA, Crombleholme TM, Donnelly LF. Allantoic cyst: a prenatal clue to patent urachus. Pediatr Radiol. 2006;36(10):1090–5.

2Van Der Bilt JDW, Van Zalen RM, Heij HA, Bilardo CM, Aronson DC. Prenatally diagnosed ruptured vesico-allantoic cyst presenting as patent urachus at birth. J Urol. 2003;169(4):1478–9.

3Bureau M, Bolduc S. Allantoic cysts and posterior urethral valves: a case report. Ultrasound Obstet Gynecol. 2011;38(1):116–8.

4Matsui F, Matsumoto F, Shimada K. Prenatally diagnosed patent urachus with bladder prolapse. J Pediatr Surg. 2007;42(12):e7–10.

5Rasteiro C, Ramalho C, Loureiro T, Pereira J, Matias A. Bladder emptying into an umbilical cord cyst: prenatal sonographic sign of allantoic cyst with patent urachus. Ultrasound Obstet Gynecol. 2013;42(2):239–40.

6Gupta N, Corbett H, Ismail R, Sathanantharajah R, Sivakumar S, McCarthy L. Allantoic cyst–an unusual umbilical cord swelling. J Surg Case Rep. 2011(4):5.

7Tolaymat LL, Maher JE, Kleinman GE, Stalnaker R, Kea K, Walker A. Persistent patent urachus with allantoic cyst: a case report. Ultrasound Obstet Gynecol. 1997;10(5):366–8.

8Weichert J, Chiriac A, Kaiser M, Thorns C, Axt-Fliedner R. Prenatal management of an allantoic cyst with patent urachus. Arch Gynecol Obstet. 2009;280(2):321–3.

9Sepulveda W, Rompel SM, Cafici D, Carstens E, Dezerega V. Megacystis associated with an umbilical cord cyst a sonographic feature of a patent urachus in the first trimester. J Ultrasound Med. 2010;29(2):295–300.

10Mazeau P, Curinier S, Kandem-Simo A, Delabaere A, Laurichesse H, Lemery D et al. Prenatal diagnosis and evolution of patent urachus. J Gynecol Obstet Biol Reprod. 2014;43(59:393–6.

11Schiesser M, Lapaire O, Holzgreve W, Tercanli S. Umbilical cord edema associated with patent urachus. Ultrasound Obstet Gynecol. 2003;22(6):646–7.

12Raga F, Bonilla-Musoles F, Castillo JC. SonoAVC: a new tool in early diagnosis of patent urachus with bladder prolapse. Ultrasound Obstet Gynecol. 2012;39(2):241–2.

13Ross JA, Jurkovic D, Zosmer N, Jauniaux E, Hacket E, Nicolaides KH. Umbilical cord cysts in early pregnancy. Obstet Gynecol. 1997;89(39:442–5.

14Zangen R, Boldes R, Yaffe H, Schwed P, Weiner Z. Umbilical cord cysts in the second and third trimesters: significance and prenatal approach. Ultrasound Obstet Gynecol. 2010;36(39:296–301.

15Gleason JM, Bowlin PR, Bagli DJ, Lorenzo AJ, Hassouna T, Koyle MA et al. A comprehensive review of pediatric urachal anomalies and predictive analysis for adult urachal adenocarcinoma. J Urol. 2015;193(2):632–6.

16Galati V, Donovan B, Ramji F, Campbell J, Kropp BP, Frimberger D. Management of urachal remnants in early childhood. J Urol. 2008;180 (4 Suppl):1824–7.

17Freedman AL, Johnson MP, Smith CA, Gonzalez R, Evans MI. Longterm outcome in children after antenatal i ntervention for obstructive uropathies. The Lancet. 1999; 31;354(9176):374-7.

Kaynak Göster