Answer to Diagnostic Challenge I

1. Graham D , Campbell J , Litchenfield K : Sonography of the umbilical cord, in Sanders RC , James AE (eds): The Principles and Practice of Ultrasonography in Obstetrics and Gynecology, ed 3. Norwalk, Connecticut, Appleton-Century-Crofts, 1985, pp 371-373.

2. Jeanty P . Romero R : Obstetrical Ultrasound. McGraw-Hill, 1984, p 219-219.

3. Sachs L , Fourcroy JL , Wenzel DJ , et al: Prenatal detection of umbilical cord allantoic cyst. Radiology 1982; 145:445-446.

4. Tranisi CP : Completely patent omphalomesenteric duct. Nebr Med J 1968: Nov:519-523.

5. Tsuchider Y , Masanubu T : Osmolar relationship between enlarged umbilical cord and patent urachus. J Ped Surg 1969;4:465-467.

6. Benirschke K , Dodds JP : Angiomyxoma of the umbilical cord with atrophy of the umbilical artery. Obstet Gynecol 1967;30:99-102.

7. Chandler C , Baum JD , et al: Giant umbilical cord associated with a patent urachus and fused umbilical arteries. Obstet Gynecol Br Commonw 1969;76:273-274.

8. Discher C : The patent omphalomesenteric duct. Illinois Med J 1971;May:493-496.

9. Ente G , Penzer PH , Konigsberg K : Giant umbilical cord associated with patent urachus. Am J Dis Child 1970; 120:82-83.

10. Casola G , Scheible W , Leopold G : Large umbilical cord: A normal finding in some fetuses. Radiology 1985; 156:181-182.

11. Thomsen K , Hiersche H : The functional morphology of the placenta, in Koppler A , Diczfalusy E (eds): Foetus and Placenta. Oxford and Edinburgh, Blackwell Scientific Publications, 1969, pp 128-129.

12. Goerther K: Die Bedevtung der funktionellen Struktur der GefaBward. T. Untersuchungen an der Nabelschnur arterie des Menschen. Morph JB 1951;91:368.

13. Zawisch C: Die Whartonsche Sulze und die Gefasse. Z Zellforsch 1955, 42:94-94.

14. Scheuner G: Uber die Verankerung der Nabelschnur an der placenta. Morph lb 1964;106:73-73.

15. Fox H : Pathology of the Placenta. Philadelphia, WB Saunders, 1978, 426-427.

16. Benirschke K , Driscoll SG : Pathology of the umbilical cord and major vessels, in The Pathology of the Human Placenta. New York, Springer, 1967; pp 56-82.

17. Ramanathan K , Epstein S , Yaghoobian J : Localized deposition of Wharton's jelly: Sonographic findings. J Ultrasound Med 1986; 5:339-340.

18. Altshuler G : Abnormalities of the placenta, membranes, and umbilical cord, in Danforth D (ed): Obstetrics and Gynecology, ed 4. Philadelphia, Harper & Row, 1982, 864-866.

19. Fortuen DW , Ostor AJ : Angiomyxomas of the umbilical cord. Obstet Gynecol 1980;55:375-378.