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Ultrasound visualization of the human yolk sac
Author(s) -
Mantoni Margit,
Pedersen Jan Fog
Publication year - 1979
Publication title -
journal of clinical ultrasound
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.272
H-Index - 61
eISSN - 1097-0096
pISSN - 0091-2751
DOI - 10.1002/jcu.1870070608
Subject(s) - medicine , ultrasound , yolk sac , fetus , pregnancy , anatomy , radiology , embryo , genetics , biology , microbiology and biotechnology
Ultrasound scanning in early pregnancy sometimes reveals a 2–5‐mm spheric structure lying adjacent to the fetus. The occurrence of this structure was studied in 60 consecutive ultrasound examinations. In the 7th to 9th weeks the sphere was seen in 19 of 22 examinations, and in the 10th and 11th weeks it was seen in 10 of 20 examinations. The sphere was not demonstrated in any of 18 examinations in the 12th to 14th weeks. It is believed that the spheric structure is the yolk sac.